I85PREP
⌘ K
CPC30620 Painting study materials
CPC30620 Painting study resources

CPC30620 Painting practice questions

One question at a time. Build your CPC30620 Painting understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Core units of competency

Under the WHS framework used in Australian painting work, what is the primary duty of a person conducting a business or undertaking (PCBU)?

  1. To ensure the health and safety of workers and others affected by the work so far as is reasonably practicable Correct answer.
  2. To guarantee that no worker is ever exposed to any hazard on site
  3. To provide safety equipment only after a worker requests it in writing
  4. To transfer all safety responsibility to each individual worker through signed agreements

Explanation

WHS law places the primary duty of care on the PCBU, who must eliminate or minimise risks so far as is reasonably practicable. This duty extends to workers, contractors, clients and visitors affected by the painting work. It is a proactive obligation, not something that can be delegated away by paperwork.

Question 2Core units of competency

Which document should be consulted before starting work to identify the hazards and controls specific to a painting task on a new site?

  1. The client's building insurance certificate
  2. The supplier's delivery docket
  3. The site-specific safe work method statement or job safety analysis Correct answer.
  4. The paint manufacturer's colour chart

Explanation

A safe work method statement or job safety analysis records the hazards of the task and the controls to be applied, and must be reviewed before work begins. It is the practical link between the general WHS duty and the actual job. Colour charts, insurance certificates and dockets serve unrelated commercial or technical purposes.

Question 3Core units of competency

Solvent-based paints and thinners must be stored on site in what way?

  1. In any unmarked container that is convenient to carry
  2. In open trays to allow vapour to disperse
  3. In closed, labelled containers within a ventilated, bunded store away from ignition sources Correct answer.
  4. Beside the hot water service to keep them warm

Explanation

Flammable liquids must be kept in closed, correctly labelled containers inside a ventilated store with spill containment, separated from heat and ignition sources. This controls both fire risk and inhalation exposure. Open trays, unmarked containers and warm locations all increase danger.

Question 4Core units of competency

What is the main purpose of reading a Safety Data Sheet (SDS) for a coating product?

  1. To learn the product's warranty period
  2. To confirm the retail price of the product
  3. To identify hazards, required controls and first aid measures for the chemical Correct answer.
  4. To determine the recommended brush type

Explanation

An SDS communicates the hazards of a chemical together with safe handling, PPE, storage and first aid information. It is the key reference for controlling exposure and responding to incidents. Pricing, warranty and application tools are covered by other product literature.

Question 5Core units of competency

A painter is spraying two-pack epoxy in a confined room. Which control combination best protects against vapour exposure?

  1. A dust mask plus opening the door once at the end of the day
  2. Forced ventilation and a supplied-air or appropriate cartridge respirator with correct filters Correct answer.
  3. Scented air freshener to mask the odour
  4. A disposable paper mask and working quickly

Explanation

Two-pack epoxies release harmful vapours that a simple dust mask cannot filter, so engineering controls such as forced ventilation plus a suitable respirator are required. Correct filter selection depends on the chemical hazard identified in the SDS. Masking odour does nothing to reduce exposure.

Question 6Core units of competency

Why is lead-based paint a particular concern when preparing surfaces on older buildings?

  1. It prevents new paint from adhering at all
  2. It dries too slowly to overcoat
  3. Sanding or blasting creates toxic lead dust that can be inhaled or ingested Correct answer.
  4. It changes colour when exposed to sunlight

Explanation

Lead compounds in older coatings become airborne dust during sanding, grinding or blasting, and lead is toxic to the nervous system. Controls include testing, dust suppression, HEPA extraction and appropriate PPE. The hazard is the dust generated, not drying time or colour.

Question 7Core units of competency

When must fall protection be considered for painting work?

  1. Only when the client specifically requests it
  2. Only when working above ten metres
  3. Only when using a ladder rather than a scaffold
  4. Whenever there is a risk of a fall that could cause injury, including from height or into openings Correct answer.

Explanation

Fall hazards must be managed whenever a person could fall far enough to be injured or could fall into an opening or excavation. Height thresholds in guidance are not a licence to ignore lower-risk falls. Controls are selected through risk assessment, not client preference.

Question 8Core units of competency

A painter needs to reach a high wall on a two-storey building. Which approach best reflects the hierarchy of control for working at height?

  1. Balance on a bucket supported by a plank
  2. Use a properly erected scaffold or elevated work platform instead of improvised access Correct answer.
  3. Stand on the top two rungs of a stepladder
  4. Lean out from an upper window with a long roller

Explanation

The hierarchy of control prefers eliminating the need to work at height, then using a safe platform such as a scaffold or elevated work platform. Improvised access and overreaching are common causes of serious falls. Selecting engineered access is the higher-order control.

Question 9Core units of competency

What is the correct action when a portable electrical tool used for paint preparation has a damaged power lead?

  1. Tag it out of service and report it for repair Correct answer.
  2. Use it only for short bursts
  3. Plug it into a different outlet to test it
  4. Wrap the damaged section in cloth tape and continue

Explanation

Damaged leads on electrical equipment must be isolated, tagged and reported so the tool cannot be used until repaired and tested. Continuing to use it risks electric shock, especially in damp painting environments. Tape repairs and short use do not remove the hazard.

Question 10Core units of competency

Which practice best controls the risk of musculoskeletal injury when repeatedly sanding overhead?

  1. Holding the tool with one hand for long periods
  2. Skipping warm-up and stretching to save time
  3. Working through pain to build stamina
  4. Using a lightweight tool, varying tasks, taking breaks and adjusting work height where possible Correct answer.

Explanation

Overhead work loads the shoulders and neck, so reducing tool weight, rotating tasks, pacing work and improving posture lower the risk. These are ergonomic controls applied at the task level. Ignoring pain or working one-handed increases strain.

Question 11Core units of competency

What does the term 'reasonably practicable' mean when deciding on risk controls?

  1. Weighing the likelihood and severity of harm against the cost, effort and availability of controls Correct answer.
  2. Doing nothing until an incident occurs
  3. Applying the same control to every site regardless of circumstances
  4. Whatever is cheapest to implement

Explanation

Reasonably practicable involves balancing the risk against the sacrifice needed to control it, including cost, time and available knowledge. Higher risk justifies more effort. It is not a simple cost test and does not permit waiting for harm to happen.

Question 12Core units of competency

Which of these is the most effective way to control paint overspray drifting onto nearby vehicles?

  1. Containment such as masking, screening or spray booths before spraying begins Correct answer.
  2. Spraying only when the wind is strong
  3. Using a finer spray tip without any containment
  4. Asking the vehicle owners to move later

Explanation

Overspray is best controlled at the source by physical containment such as masking, screens or a booth, which prevents drift entirely. This is an engineering control and ranks above administrative measures. Relying on wind or tip choice leaves the hazard uncontrolled.

Question 13Core units of competency

What should a painter do first if a colleague collapses after inhaling solvent vapour in a confined space?

  1. Raise the alarm, follow the emergency plan and avoid entering until it is safe to do so Correct answer.
  2. Enter immediately without protection to drag them out
  3. Wait to see if they recover on their own
  4. Open a tin of fresh paint to freshen the air

Explanation

A confined-space rescue must follow the emergency plan, with the alarm raised and rescuers protected from the same atmosphere. Untrained unprotected entry often produces a second casualty. Prompt, planned action is essential because solvent exposure can be fatal.

Question 14Core units of competency

Which statement correctly describes the relationship between a material safety approach and environmental protection when washing brushes?

  1. Wash water containing paint residue should go straight into the stormwater drain
  2. Wash water should be left to evaporate in an open drum in the sun
  3. Wash water should be contained and disposed of according to environmental requirements, not released to drains Correct answer.
  4. Wash water can be poured onto garden beds because it is only paint

Explanation

Paint residue and solvents are pollutants, so wash water must be collected and disposed of through approved waste arrangements. Stormwater drains lead to waterways and must never receive paint waste. Garden disposal and open evaporation both create contamination or vapour hazards.

Question 15Core units of competency

When preparing a previously painted exterior surface, what does the term 'chalking' describe?

  1. A stain caused by timber tannins bleeding through
  2. A type of brush mark left by a worn brush
  3. A hard glossy film that resists sanding
  4. A powdery surface residue that forms as the binder breaks down under weathering Correct answer.

Explanation

Chalking is the powdery layer left when a coating's binder degrades from weathering, and it must be removed so new paint can bond. It is a surface condition, not a brush defect or tannin stain. Recognising it guides preparation and product choice.

Question 16Core units of competency

Why is it important to check the moisture content of new timber before painting?

  1. High moisture can cause blistering, poor adhesion and staining of the finish Correct answer.
  2. Dry timber absorbs paint too quickly to spread
  3. Moisture improves the gloss level of the topcoat
  4. Timber moisture has no effect on coating performance

Explanation

Painting timber that is too wet traps moisture, which can blister the film, reduce adhesion and carry extractives to the surface as stains. Coating manufacturers specify acceptable moisture levels for this reason. Checking moisture is a routine preparation step.

Question 17Core units of competency

What is the purpose of applying a primer to a bare substrate?

  1. To fill deep structural cracks in masonry
  2. To seal and stabilise the surface and promote adhesion of subsequent coats Correct answer.
  3. To replace the need for any topcoat
  4. To provide the final decorative colour

Explanation

A primer prepares the substrate by sealing it, blocking stains and creating a bond for the following coats. It is not the decorative finish and does not substitute for topcoats. Structural crack repair requires separate patching materials.

Question 18Core units of competency

A painter is applying a water-based acrylic over a glossy alkyd enamel without preparation. What is the most likely outcome?

  1. The acrylic will chemically dissolve the enamel
  2. Poor adhesion and possible peeling due to the glossy, low-porosity surface Correct answer.
  3. The finish will be unaffected because gloss does not matter
  4. Excellent adhesion because acrylic bonds to any surface

Explanation

Glossy enamel provides little mechanical key, so a water-based topcoat may not bond and can peel. Preparation such as sanding and appropriate priming is needed to create adhesion. Acrylic does not dissolve a cured enamel film.

Question 19Core units of competency

Which factor most directly determines the spreading rate of a paint on a given surface?

  1. The solids content and film thickness specified by the manufacturer Correct answer.
  2. The brand of the brush
  3. The colour of the paint
  4. The time of day the paint is applied

Explanation

Spreading rate depends mainly on the coating's solids and the wet film thickness needed to achieve the specified dry film. Manufacturers publish coverage figures based on these properties. Colour, brush brand and time of day do not set the coverage rate.

Question 20Core units of competency

What is the recommended technique for cutting in a clean line where a wall meets a ceiling?

  1. Mask the entire wall and spray the ceiling
  2. Load the brush heavily and drag it along the corner
  3. Apply a steady line with a lightly loaded angled brush, working in manageable sections Correct answer.
  4. Use a roller straight into the corner first

Explanation

Cutting in relies on a lightly loaded angled brush and controlled strokes in short sections to keep a straight edge. Overloading causes runs and wavy lines. A roller cannot form a crisp corner line, and spraying is a different method.

Question 21Core units of competency

Why should a painter 'lay off' a freshly rolled wall with a dry roller or brush before the paint sets?

  1. To even out roller stipple and produce a uniform finish Correct answer.
  2. To change the colour of the coating
  3. To remove all the paint from the surface
  4. To speed up drying by adding air

Explanation

Laying off smooths the stipple left by the roller and blends overlaps while the paint is still workable. This improves the appearance of the finished film. It does not strip paint, accelerate curing or alter colour.

Question 22Core units of competency

A painter notices the paint film has sagged into runs on a vertical surface shortly after application. What is the most likely cause?

  1. The paint was applied too thinly
  2. The brush was too narrow
  3. The surface was too warm
  4. The coating was over-thinned or applied too heavily Correct answer.

Explanation

Sagging occurs when the wet film is too thick to support itself, often from over-application or excessive thinning. Reducing film thickness and following the manufacturer's thinning limits prevents it. A narrow brush or warm surface alone does not cause runs in the same direct way.

Question 23Core units of competency

Which statement best explains why adequate ventilation is needed when using solvent-based paints indoors?

  1. To reduce the concentration of flammable and harmful vapours in the breathing zone Correct answer.
  2. To prevent the paint from adhering to the wall
  3. To make the paint dry faster than the manufacturer recommends
  4. To increase the gloss of the finish

Explanation

Ventilation dilutes solvent vapour, lowering both the risk of inhalation exposure and the risk of a flammable atmosphere. It is an engineering control that works alongside PPE. It is not intended to alter drying rate, gloss or adhesion.

Question 24Core units of competency

A painter must estimate how much paint is needed for a wall of 40 square metres using a product with a spreading rate of 10 square metres per litre per coat, applying two coats. How much paint is required?

  1. 2 litres
  2. 8 litres Correct answer.
  3. 4 litres
  4. 40 litres

Explanation

One coat needs 40 divided by 10, which is 4 litres, and two coats require twice that, so 8 litres. Multiplying the area by the number of coats before dividing by the spreading rate gives the same result. Ordering slightly more allows for loss and touch-up.

Question 25Core units of competency

Why is it good practice to keep a wet edge when rolling large areas in warm conditions?

  1. It prevents lapping marks and visible joins between sections Correct answer.
  2. It makes the paint dry more slowly than the manufacturer specifies
  3. It allows the painter to skip surface preparation
  4. It guarantees a single-coat finish on any surface

Explanation

In warm conditions paint sets quickly, so working into a wet edge blends sections and avoids lap marks. This is an application technique that improves appearance. It does not change drying specifications, replace preparation or guarantee single-coat coverage.

Question 26Core units of competency

Under the model WHS Regulations, what is the primary duty of a person conducting a business or undertaking (PCBU) in relation to painting work?

  1. Delegate all safety responsibilities to the principal contractor on site
  2. Provide personal protective equipment only when a worker requests it
  3. Ensure the health and safety of workers and others affected by the work, so far as is reasonably practicable Correct answer.
  4. Guarantee that no worker will ever be injured on a painting project

Explanation

The PCBU holds the primary duty of care under WHS law and must eliminate or minimise risks to health and safety so far as is reasonably practicable. This duty extends to workers, contractors, visitors and the public who may be affected by the painting work. It is proactive and cannot be transferred or limited to providing PPE on request.

Question 27Core units of competency

Which document should a painter consult to find the specific first-aid, storage and disposal instructions for a particular solvent-based coating?

  1. The safety data sheet (SDS) for the product Correct answer.
  2. The project architectural specification
  3. The manufacturer's colour card
  4. The paint retailer's promotional brochure

Explanation

The safety data sheet is the legally required source of hazard, first-aid, handling, storage and disposal information for a hazardous chemical. Painters must read the SDS before using an unfamiliar product. Specifications and marketing material do not contain the detailed safety instructions required for safe use.

Question 28Core units of competency

What is the main purpose of a Job Safety Analysis (JSA) or Safe Work Method Statement (SWMS) before starting a painting task?

  1. To list the names of workers who have previously painted the site
  2. To record the quantity of paint used on the previous job
  3. To provide a quote for the client to approve
  4. To identify hazards and document the controls before work begins Correct answer.

Explanation

A JSA or SWMS is a planning tool that identifies the hazards of a specific task and sets out the control measures to be applied. It must be prepared before work starts and reviewed as conditions change. It is not a costing, purchasing or historical record document.

Question 29Core units of competency

Which type of fire extinguisher is suitable for a small fire involving solvent-based paint and thinners?

  1. Water (A) extinguisher
  2. Carbon dioxide (B:E) extinguisher
  3. Foam (A:B) extinguisher Correct answer.
  4. Wet chemical (F) extinguisher

Explanation

Solvent-based paints and thinners are flammable liquids, which are Class B fires. A foam extinguisher is rated for Class B and smothers the surface to prevent re-ignition. Water and wet chemical extinguishers are not rated for flammable liquid fires.

Question 30Core units of competency

What is the correct way to store solvent-based paints and thinners in a workshop?

  1. In a locked, ventilated flammable liquids cabinet away from ignition sources Correct answer.
  2. On an open shelf next to the workshop heater for easy access
  3. In unlabelled plastic containers under the workbench
  4. Outdoors in direct sunlight to keep the product warm

Explanation

Flammable liquids must be kept in a closed, labelled container inside a dedicated flammable liquids cabinet that is ventilated and away from ignition sources. This limits vapour accumulation and fire risk. Open shelves, unlabelled containers and sunlight exposure all increase the danger.

Question 31Core units of competency

Which document should be checked to confirm that a newly delivered tin of two-pack epoxy contains the correct proportions of base and hardener?

  1. The technical data sheet for the product Correct answer.
  2. The client's colour selection form
  3. The site induction sign-in sheet
  4. The delivery docket only

Explanation

The technical data sheet gives the mixing ratio, pot life and application data for a specific product. Painters must follow the manufacturer's ratio to ensure the coating cures correctly. A delivery docket confirms quantities delivered but not mixing proportions.

Question 32Core units of competency

What does the term 'VOC' mean in relation to paints and coatings?

  1. Volatile organic compounds that can vaporise and affect indoor air quality Correct answer.
  2. Verified opacity coverage rating of a paint film
  3. Viscosity optimisation control added to improve flow
  4. Vapour output coefficient used to measure film thickness

Explanation

VOC stands for volatile organic compounds, which are carbon-based chemicals that evaporate from solvent-based and some water-based products. They contribute to air pollution and can cause health effects such as headaches and respiratory irritation. Low-VOC products are preferred in enclosed spaces.

Question 33Core units of competency

Why should a painter wear appropriate respiratory protection when spray painting in a booth?

  1. To improve the gloss level of the dried film
  2. To reduce the amount of paint used on the job
  3. To prevent inhalation of fine paint mist and solvent vapour Correct answer.
  4. To keep the painter's face clean of overspray

Explanation

Spray painting creates fine airborne paint mist and solvent vapour that can be inhaled deep into the lungs. A suitable respirator with the correct filter reduces exposure to these hazards. The purpose is health protection, not appearance, finish quality or paint economy.

Question 34Core units of competency

A painter is about to sand a large area of old paint inside an occupied house. Which control should be implemented first to protect occupants from dust?

  1. Isolate the work area with plastic sheeting and use dust-extraction sanding equipment Correct answer.
  2. Wear a dust mask and begin sanding immediately
  3. Ask the occupants to stay in one room while sanding proceeds
  4. Open a window and continue sanding without other controls

Explanation

The hierarchy of control requires eliminating or isolating the hazard before relying on administrative measures or PPE. Physical containment with plastic sheeting and dust extraction at the source prevents dust from spreading into occupied areas. Asking occupants to stay in a room or simply opening a window does not control the dust adequately.

Question 35Core units of competency

When two painters are working on scaffolding at different levels, what is the most effective way to prevent objects falling onto the lower worker?

  1. Use toe boards and a catch platform or netting on the scaffold Correct answer.
  2. Warn the lower worker by calling out before dropping tools
  3. Instruct the lower worker to look up frequently
  4. Schedule the lower worker to take breaks while the upper worker is active

Explanation

Toe boards and catch platforms or netting are engineering controls that physically prevent objects from falling off the scaffold. They protect everyone below regardless of attention or timing. Administrative measures such as warnings and breaks rely on human behaviour and are less reliable.

Question 36Core units of competency

What should a painter do immediately after discovering a small solvent spill on the workshop floor?

  1. Contain the spill with absorbent material and dispose of it according to the SDS Correct answer.
  2. Leave it to evaporate and continue working
  3. Hose the spill into the stormwater drain to dilute it
  4. Cover it with a rag and walk over it to spread it out

Explanation

Spills must be contained and cleaned up promptly using absorbent material, and the waste disposed of as directed by the safety data sheet. This prevents slip hazards, fire risk and environmental contamination. Washing to stormwater or allowing evaporation causes pollution and exposure.

Question 37Core units of competency

A painter is using a solvent-based product in a small room. Which combination best controls exposure to solvent vapour?

  1. Forced ventilation with the correct organic vapour respirator and reduced exposure time Correct answer.
  2. A single open window with no respirator and no time limit
  3. A dust mask and a closed door to contain the smell
  4. A fan blowing the vapour toward the painter's face

Explanation

Effective control of solvent vapour requires engineering controls such as forced ventilation to remove vapours at the source, supported by a suitable respirator and limited exposure time. Relying on a single open window or a dust mask is inadequate. A fan directed at the painter increases rather than reduces exposure.

Question 38Core units of competency

When preparing a previously painted surface that may contain lead, which action is required before sanding or heat stripping?

  1. Proceed with dry sanding because the old paint is fully cured
  2. Sand the surface outdoors without respiratory protection
  3. Burn off the paint with a heat gun and sweep up the residue
  4. Test the paint for lead and use wet methods or chemical strippers if lead is present Correct answer.

Explanation

Old paint on pre-1970s buildings may contain lead, so it must be tested before any disturbance. If lead is present, wet sanding, chemical stripping or other dust-minimising methods must be used with appropriate PPE. Dry sanding and heat stripping can generate lead dust or fumes that are hazardous.

Question 39Core units of competency

What is the main reason for using a residual current device (RCD) with portable electrical tools on a painting site?

  1. To increase the running speed of the tool
  2. To reduce the noise level of the tool
  3. To convert battery tools to mains power
  4. To disconnect the power quickly if current leaks to earth Correct answer.

Explanation

An RCD monitors current flow and trips quickly when it detects leakage to earth, reducing the risk of electric shock. It does not change tool performance, power source or noise. Its purpose is electrical safety for the operator.

Question 40Core units of competency

What does a painter need to check before using a mobile scaffold tower on a sloping surface?

  1. That the wheels are free to roll so the tower can be moved easily
  2. That the scaffold is level, the brakes are applied and outriggers or stabilisers are fitted Correct answer.
  3. That the tower is tied to a nearby vehicle for stability
  4. That only one worker stands on the top platform at a time

Explanation

A mobile scaffold must be erected on a level, firm surface with the castors locked and outriggers or stabilisers in place to prevent overturning. Wheels must not be free to roll while in use. Tying a scaffold to a vehicle is unsafe and not an approved method.

Question 41Core units of competency

Which practice best protects a painter's hearing when using a high-pressure airless spray unit in a confined space?

  1. Turning the unit up to maximum to finish faster
  2. Relying on the noise being intermittent
  3. Wearing correctly rated hearing protection and limiting exposure time Correct answer.
  4. Placing the unit outside the room and leaving the door open

Explanation

High-pressure spray units produce hazardous noise levels, so suitable hearing protection and reduced exposure time are required. Intermittent noise still damages hearing, and increasing power raises noise further. Moving the unit outside helps but does not eliminate the noise reaching the painter.

Question 42Core units of competency

Why is it important to follow the manufacturer's induction period when mixing a two-pack coating?

  1. To prevent the paint from drying in the pot
  2. To increase the volume of paint available
  3. To make the paint easier to pour from the tin
  4. To allow the chemical reaction to begin so the coating cures correctly Correct answer.

Explanation

Two-pack products cure by chemical reaction between base and hardener, and the induction period allows that reaction to start before application. Skipping it can cause poor cure, loss of gloss or premature failure. The induction period is not about pouring ease, volume or pot life.

Question 43Core units of competency

A painter is preparing a steel balustrade for painting. What is the correct sequence for surface preparation?

  1. Degrease, apply topcoat, then remove rust through the wet film
  2. Prime the steel, then remove rust with a wire brush and apply topcoat
  3. Remove rust and scale, degrease, then apply a primer before the topcoats Correct answer.
  4. Apply topcoat first, then degrease and prime any bare areas

Explanation

Steel must be free of rust, scale and grease before a primer is applied, because the primer bonds to clean metal and provides corrosion protection. Topcoats are applied over the primer. Removing rust after priming damages the protective layer and leads to early failure.

Question 44Core units of competency

Which statement best explains why a painter should use a tack cloth before applying a gloss enamel topcoat?

  1. To cool the surface before painting
  2. To add a slight texture that improves adhesion
  3. To remove fine dust that would otherwise be trapped in the wet film Correct answer.
  4. To leave an oily residue that helps the paint flow

Explanation

A tack cloth picks up fine dust and particles from the prepared surface so they are not locked into the drying gloss film. Trapped dust causes roughness and visible defects. A tack cloth should not leave oil or texture, and it does not change surface temperature.

Question 45Core units of competency

What is the most likely consequence of applying a solvent-based topcoat over a previously applied water-based primer that is still soft?

  1. The topcoat will cure faster than normal
  2. Solvent penetration may lift or wrinkle the primer film Correct answer.
  3. The finish will become harder and more durable
  4. The colour of the topcoat will become lighter

Explanation

Solvent-based coatings contain strong solvents that can penetrate and soften an undercured water-based primer, causing lifting or wrinkling. The primer must be fully dry and hard before the topcoat is applied. Cure speed, hardness and colour are not improved by coating over a soft primer.

Question 46Core units of competency

Which statement correctly describes the role of a sealer or undercoat when painting a porous masonry wall?

  1. It increases the texture of the wall for a rustic look
  2. It replaces the need for any topcoat
  3. It evens out absorption so the topcoat dries uniformly and holds colour Correct answer.
  4. It waterproofs the wall permanently against rising damp

Explanation

Porous masonry draws binder and solvent out of the topcoat unevenly, causing patchy gloss and colour. A sealer or undercoat balances absorption so the finish coat dries consistently. It is not a permanent waterproofing system, does not replace the topcoat and is not used to add texture.

Question 47Core units of competency

A painter is using a roller on a large ceiling in hot weather. Which practice best prevents lap marks?

  1. Apply the paint in direct sunlight to speed drying
  2. Work in manageable sections and maintain a wet edge by rolling back into the fresh paint Correct answer.
  3. Thin the paint heavily so it dries more slowly
  4. Roll the entire ceiling quickly and then go back over the dry edges

Explanation

Lap marks occur when fresh paint overlaps paint that has already begun to set. Working in sections and keeping a wet edge allows the paint to blend. Rolling quickly and returning to dry edges, over-thinning, or painting in direct sun all increase the risk of lap marks.

Question 48Core units of competency

A painter is asked to calculate the quantity of paint needed for a wall 12 m long and 3 m high, using a product with a spreading rate of 10 m² per litre and requiring two coats. How much paint is needed?

  1. 36 litres
  2. 7.2 litres Correct answer.
  3. 14.4 litres
  4. 3.6 litres

Explanation

The wall area is 12 m × 3 m = 36 m². Two coats require 72 m² of coverage, and at 10 m² per litre this equals 7.2 litres. The other figures either ignore the second coat or miscalculate the area.

Question 49Core units of competency

A painter notices that a newly applied gloss enamel is drying with a dull, hazy film in a humid room. Which is the most likely cause?

  1. Excessive thinning of the paint with the correct thinner
  2. Using a paint colour that is too light
  3. Applying the paint with a brand-new brush
  4. Moisture condensing on the film as the solvent evaporates and cools the surface Correct answer.

Explanation

Solvent evaporation cools the wet film, and in humid conditions moisture can condense on the surface and become trapped, producing a dull haze known as blushing. Correct thinning, a clean brush and the colour chosen do not cause this effect. Improving ventilation and reducing humidity prevents it.

Question 50Core units of competency

A painter has applied a stain-blocking primer over a water stain on a ceiling, but the stain reappears after the topcoat. What is the most likely explanation?

  1. The water source was not repaired and moisture is still migrating through the substrate Correct answer.
  2. The primer was applied with a roller instead of a brush
  3. The ceiling was painted in the afternoon rather than the morning
  4. The topcoat was applied too thinly

Explanation

A stain-blocking primer seals the surface but cannot stop ongoing moisture movement. If the leak or damp source is not fixed, water continues to migrate and the stain returns through the new film. Application method, topcoat thickness and time of day do not cause stain recurrence.