CPC30620 Painting flashcards

34 cards. Read the term and the definition here. The deck at the top of this page is optional.

Hierarchy of control

The ranked order of risk controls: eliminate, substitute, engineering controls, administrative controls, then PPE. Higher-order controls are more reliable because they do not depend on individual behaviour.

Safety data sheet

A document supplied with each hazardous chemical that states its hazards, first-aid measures, handling and storage requirements, and required PPE. It must be accessible to workers using the product.

Duty of care

The legal obligation on employers and workers to take reasonable steps to protect the health and safety of themselves and others affected by their work, including clients and the public.

Face velocity

The speed of air moving across the open face of a spray booth, typically about 0.5 metres per second. It determines whether solvent vapour is captured rather than escaping.

LEV system

Local exhaust ventilation that captures dust, mist or vapour at its source before it enters the breathing zone. It must be inspected and tested regularly to remain effective.

Respirator fit test

A check that a respirator seals to the wearer's face. Qualitative tests use a bitter or sweet agent; quantitative tests measure leakage. Fit testing is repeated when facial conditions change.

Timber moisture content

The percentage of water in timber relative to its dry mass. Coating is normally delayed until it falls to roughly 12 to 15 percent, otherwise trapped moisture causes blistering or poor adhesion.

Substrate pH test

A check of masonry or concrete alkalinity before painting. Coatings generally need the surface below about pH 9; highly alkaline surfaces burn or saponify conventional paints.

Abrasive grit grade

A number describing abrasive particle size; lower numbers are coarser. Timber is sanded progressively finer with the grain, and jumping grades wastes effort and can leave scratch marks.

Primer function

A first coat designed to seal the substrate, promote adhesion and block stains or alkalinity. It is not a finish coat and its specification depends on the substrate type.

Dry film thickness

The thickness of the cured paint film, measured with a gauge on the substrate. It is the property specified by the coating manufacturer and controls durability and performance.

Spreading rate

The area a litre of paint covers at the specified film thickness, expressed in square metres per litre. Area divided by spreading rate gives litres per coat.

Sheen level

The degree of light reflection from a dried film, from flat through low sheen to gloss. Higher sheen gives better washability; lower sheen hides surface imperfections.

Lead paint hazard

Older paint may contain lead. Dry sanding creates toxic dust, so wet methods, chemical strippers and HEPA extraction are used, with specific regulations applying to removal.

Material safety planning

Identifying hazardous products on site, obtaining current safety data sheets, and confirming storage, decanting and disposal arrangements before work starts.

Waste segregation

Separating solvent waste, empty containers, masking film and general waste so each stream is disposed of through the correct licensed pathway rather than to general refuse.

Airless spray tip size

A three-digit code where the first digit is orifice diameter in thousandths of an inch and the last two give fan width at a set distance, for example 517.

HVLP spraying

High volume low pressure spraying, which uses large air volume at low pressure to atomise paint. It raises transfer efficiency and reduces overspray compared with conventional air spray.

Fan pattern test

A trial spray onto scrap material to check atomisation. A correct pattern is even across its width; tails or fingers indicate pressure or fluid adjustment is needed.

Pot life

The usable working time after a two-pack product's components are mixed. Once the pot life elapses the mixture gels and must be discarded, not thinned.

Epoxy coating

A two-pack coating with strong adhesion and resistance to water and chemicals. It chalks and yellows under ultraviolet light, so it is usually overcoated outdoors.

Polyurethane topcoat

A coating with good ultraviolet and abrasion resistance, often applied over an epoxy primer on exterior steel. Aliphatic grades resist yellowing better than aromatic grades.

Ragging finish

A decorative technique where a glaze applied over a cured basecoat is lifted with a bunched cloth to leave a mottled texture. Test panels are made before full application.

Sponging technique

A decorative finish made by dabbing a glaze with a natural or synthetic sponge over a basecoat, producing a broken, cloudy texture. Glaze open time controls the effect.

Sizing walls

Applying a sealer to plaster before wallpapering. It controls absorption so paste does not sink in, and it allows the paper to be stripped later without damaging the surface.

Booking wallpaper

Folding pasted paper face to face and letting it rest so the paste soaks in and the paper relaxes. This prevents shrinkage gaps and edge lifting after hanging.

Pattern match

The alignment of repeats between adjacent wallpaper drops. Straight match aligns at the same point; drop match offsets alternate drops by half a repeat, increasing waste.

Vinyl film application

Applying adhesive-backed graphics using a squeegee from the centre outwards. It requires a clean, dry surface and a minimum surface temperature, commonly above 10 degrees Celsius.

Signwriting enamel

A slow-drying, high-opacity paint used for lettering by brush. Its long open time allows brush marks to flow out, and it adheres to properly prepared sealed surfaces.

Blistering defect

Bubbles under a paint film caused by moisture or solvent trapped in or under the coating. Correction requires removal of the affected film back to a sound substrate.

Wrinkling defect

Shrivelled or ridged paint surface caused by recoating before the previous coat has cured, or by an incompatible thinner. The film skins over while solvent remains beneath.

Sagging defect

Downward runs in a wet film caused by over-thinning, excessive film build or spraying too close. It is corrected by sanding back once cured and reapplying at correct thickness.

Texture coating

A thick render-like coating applied by trowel, roller or hopper gun. Thickness and inter-coat drying time are controlled to limit cracking, and movement joints stay uncoated.

Tinting increment

The small measured addition of colourant used when matching a colour. Darker colours have lower hiding power, so a tinted primer reduces the topcoats needed.