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Cert III Refinishing study materials
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Cert III Refinishing practice questions

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Question 1Core units

Which document gives the manufacturer's instructions for mixing ratio, pot life, and recoat windows for a two-part clearcoat?

  1. The vehicle owner's manual
  2. The spray booth maintenance log
  3. The shop's waste disposal permit
  4. The product technical data sheet Correct answer.

Explanation

A technical data sheet is published by the coating manufacturer and lists the specific mixing ratio, pot life, induction time, and recoat window for that product. These values differ between products, so the sheet for the exact product in use must be consulted rather than general shop practice.

Question 2Core units

A technician is sanding a panel and the abrasive loads up quickly with soft, gummy material. What is the most likely cause?

  1. The sanding block is too rigid for the contour
  2. The paper was stored in a humid area
  3. The coating being sanded has not cured sufficiently Correct answer.
  4. The abrasive grit is too coarse for the substrate

Explanation

Under-cured paint remains soft and tends to smear and clog the abrasive instead of cutting into dust. Coarse grit or a rigid block changes the scratch pattern or contouring but does not typically produce gummy loading. Allowing proper cure time, or checking the recoat and cure data, resolves the condition.

Question 3Core units

What is the primary purpose of applying a primer surfacer to a repaired panel?

  1. To act as an adhesion promoter for bare plastic only
  2. To provide the final colour and gloss
  3. To seal the panel against moisture permanently
  4. To build film thickness and fill sanding scratches before topcoat Correct answer.

Explanation

Primer surfacer builds a sandable film that fills minor imperfections and sanding scratches, creating a uniform surface for the topcoat. It is sanded after curing to level the repair area. Sealing, colour, and gloss are functions of other products in the system.

Question 4Core units

A technician must spray a small area and blend the repair into the adjacent panel. Which technique best supports an invisible blend?

  1. Increase fluid flow and lower air pressure at the edge
  2. Mask a hard line at the midpoint of the panel
  3. Reduce and fade the colour out within the blend area Correct answer.
  4. Apply full wet coats right up to the panel gap

Explanation

Blending relies on a gradual transition, so the colour is applied thinner and reduced toward the outer edge of the blend zone. This lets the new colour melt into the existing finish without a visible edge. A hard masked line or a full wet coat at the boundary leaves a detectable step.

Question 5Core units

Which personal protective equipment is essential when spraying two-component products containing isocyanates?

  1. A dust mask rated for nuisance dust
  2. Safety glasses alone in a ventilated booth
  3. A supplied-air respirator with full face coverage Correct answer.
  4. A charcoal half-mask used for solvent vapours

Explanation

Isocyanate hardeners can cause severe respiratory sensitisation, so spraying requires an atmosphere-supplying respirator rather than an air-purifying mask. Full face coverage also protects the eyes from overspray. Dust masks and solvent cartridges do not provide adequate protection.

Question 6Core units

Why must bare steel be cleaned and treated before primer is applied?

  1. To soften the metal for easier sanding
  2. To increase the electrical conductivity of the panel
  3. To raise the surface temperature for faster curing
  4. To remove oils and oxides so the primer can bond Correct answer.

Explanation

Bare steel carries mill scale, rust, and oily residue that prevent adhesion if left in place. Cleaning and applying the specified pretreatment or etch primer creates a sound surface for the following coats. Contaminants trapped under primer lead to peeling and corrosion.

Question 7Core units

A spray gun is set with the fluid needle fully open and the technician notices the pattern is heavy and wet. Which adjustment should be made first?

  1. Increase the inlet air pressure
  2. Thin the material further
  3. Reduce the fluid flow at the fluid control knob Correct answer.
  4. Move the gun closer to the panel

Explanation

A heavy, wet pattern usually indicates too much fluid for the air available, so the fluid control should be reduced to restore balance. Adjusting air pressure or distance can compensate but does not correct the underlying fluid setting. Thinning changes the product beyond the manufacturer's specification.

Question 8Core units

Which defect is caused by applying coats too wet and too close together without adequate flash-off time?

  1. Orange peel
  2. Solvent popping Correct answer.
  3. Fish eyes
  4. Dry spray

Explanation

Solvent popping appears as small pinholes because trapped solvent escapes through a surface that has already skinned over. It results from heavy wet coats and insufficient flash time between them. Allowing each coat to flash before the next prevents the condition.

Question 9Core units

What is the correct action when a batch of mixed two-component primer has exceeded its pot life?

  1. Strain it and use it within the hour
  2. Place it in a refrigerator to slow the reaction
  3. Discard it and mix a fresh batch Correct answer.
  4. Add fresh reducer to restore the viscosity

Explanation

Once a catalysed product passes its pot life, the chemical reaction has advanced enough that the material will not cure properly or flow correctly. Adding thinner or cooling does not reverse the reaction. The batch must be discarded according to local regulations and replaced.

Question 10Core units

Which step is required before applying refinish materials over a previously painted panel of unknown finish?

  1. Identify the existing coating type and test for compatibility Correct answer.
  2. Apply a heavy coat of clearcoat as a barrier
  3. Scuff the entire panel with a fine pad and spray directly
  4. Wet sand the panel with solvent to dissolve the old finish

Explanation

Unknown finishes may be lacquer, enamel, urethane, or a factory coating that reacts differently to new products. Identifying the type and performing a compatibility test prevents lifting and wrinkling. A barrier coat may then be selected based on the test result.

Question 11Core units

A technician notices the spray pattern has a split, hourglass shape. What is the most likely cause?

  1. The fluid tip is partially clogged or the air cap horns are dirty Correct answer.
  2. The material is too thin
  3. The gun is held too far from the panel
  4. The booth airflow is too high

Explanation

A split or hourglass pattern indicates that air from the cap horns is being restricted, often by dried material in the passages, or that the fluid tip is partially blocked. Cleaning the cap and tip restores an even fan. Viscosity and distance affect other pattern characteristics.

Question 12Core units

Why is a tack cloth used immediately before applying the first coat of primer or sealer?

  1. To smooth the sanding scratches left by the last grit
  2. To add a slight tack to the surface for adhesion
  3. To remove dust and lint that would be trapped in the film Correct answer.
  4. To neutralise static electricity on plastic panels

Explanation

Tack cloths pick up fine dust and lint that sanding and wiping leave behind, preventing them from being locked into the coating. Contamination trapped under a coat causes nibs and craters. The cloth is used lightly so it does not leave residue.

Question 13Core units

Which condition most commonly causes fish eyes in a freshly applied topcoat?

  1. A basecoat that was applied too dry
  2. Too much air pressure at the gun
  3. Silicone or oil contamination on the panel Correct answer.
  4. Excessive booth humidity during spraying

Explanation

Fish eyes are circular craters formed when the coating pulls away from spots of low surface tension, typically silicone, oil, or polish residue. Thorough cleaning and the correct prep solvent prevent them. Humidity, pressure, and dry basecoat produce different defects.

Question 14Core units

What is the purpose of an adhesion promoter when refinishing a bare plastic bumper?

  1. To create a chemical bridge that helps the coating bond to the plastic Correct answer.
  2. To fill deep scratches in the plastic surface
  3. To add flexibility so the bumper can flex without cracking
  4. To provide UV protection for the plastic

Explanation

Many plastics have low surface energy, so coatings do not bond well directly. An adhesion promoter forms a chemical bridge between the plastic and the following primer or topcoat. Flexibility and UV protection come from other components of the system.

Question 15Core units

During a colour match, a technician finds the sprayout is slightly darker and less flourescent than the adjacent panel. Which approach is most appropriate?

  1. Wet sand the basecoat before clearing to open the colour
  2. Increase the film build of the basecoat to hide the difference
  3. Apply extra clearcoat to lighten the appearance
  4. Spray the panel with a lighter variant and blend within the panel Correct answer.

Explanation

When a variant is close but not exact, selecting an adjacent variant and blending within the panel allows the eye to accept the transition. Film build and clearcoat do not correct hue differences. Wet sanding basecoat damages metallic orientation.

Question 16Core units

Which practice best prevents contamination from compressed air lines reaching the finish?

  1. Draining the receiver only once a year
  2. Increasing compressor cut-out pressure
  3. Using a longer hose between the regulator and the gun
  4. Installing and maintaining filters and a coalescing dryer at the gun Correct answer.

Explanation

Compressed air carries oil, water, and particulate from the compressor and lines. Coalescing filters and a dryer at the point of use remove these contaminants before they reach the gun. Regular draining and filter changes keep the system effective.

Question 17Core units

What does a wet film thickness gauge measure during application?

  1. The viscosity of the mixed product
  2. The thickness of the coating while still wet Correct answer.
  3. The cured film thickness after full drying
  4. The surface profile of the sanded substrate

Explanation

A wet film gauge is pressed into the freshly applied coating to read film build before the material flows and cures. This allows the technician to correct the application before the coat sets. Cured thickness is measured later with an electronic gauge.

Question 18Core units

A technician is repairing a small dent and must decide between using body filler and a glazing putty. Which statement reflects correct use?

  1. Body filler should only be used over bare plastic
  2. Body filler is used for deep fills and glazing putty for shallow imperfections Correct answer.
  3. Both products are interchangeable for any depth of repair
  4. Glazing putty is used for deep fills and body filler for pinholes

Explanation

Body filler is designed to build thickness and fill deeper depressions, while glazing putty is a finer material for shallow pinholes and scratches. Using putty for deep fills leads to shrinkage and cracking. The correct product for each stage keeps the repair sound.

Question 19Core units

Which safety practice is required when storing catalysed paint waste and solvent-soaked rags?

  1. Place them in a closed, approved metal container away from ignition sources Correct answer.
  2. Stack them in cardboard boxes in a storage room
  3. Leave them to evaporate in a ventilated area
  4. Store them in an open bin near the booth entrance

Explanation

Solvent-soaked rags can self-heat and ignite, so they must be kept in a closed, approved metal container away from ignition sources. Open or cardboard storage allows vapour accumulation and fire risk. Evaporating solvent releases hazardous vapours into the workplace.

Question 20Core units

Why is it important to follow the recommended flash-off time between basecoat coats?

  1. To prevent the basecoat from drying too quickly
  2. To let the metallic flakes settle to the bottom of the film
  3. To allow the solvents to escape so the next coat adheres properly Correct answer.
  4. To increase the gloss of the finished clearcoat

Explanation

Flash-off gives the solvents in a coat time to evaporate before the next coat is applied. Skipping it traps solvent, causing runs, solvent popping, or poor adhesion. The time is specified by the product data sheet and varies with temperature and airflow.

Question 21Core units

A technician is blending clearcoat into a panel and must avoid a visible edge. Which technique is most effective?

  1. Apply a full wet coat across the entire panel
  2. Mask a sharp line at the blend boundary
  3. Polish the edge after the clearcoat has fully cured for a week
  4. Use a blending solvent or reduced clearcoat to melt the edge into the existing finish Correct answer.

Explanation

Blending clearcoat requires a gradual transition, often achieved by using a dedicated blending solvent or a reduced clearcoat at the edge. This softens the boundary so the new film merges with the old. A sharp mask line or a full wet coat leaves a visible step.

Question 22Core units

What is the correct procedure when a technician discovers a run in a freshly applied clearcoat that has not yet cured?

  1. Wipe the run with reducer and continue
  2. Apply another wet coat over the run to level it
  3. Allow the clearcoat to cure, then sand and polish the run out Correct answer.
  4. Sand the run out immediately while the film is wet

Explanation

A run in uncured clearcoat cannot be sanded without smearing the film, so the coating must be allowed to cure fully. Once cured, the run is block sanded and polished to restore the surface. Adding more wet material or wiping with reducer makes the defect worse.

Question 23Core units

Which factor most directly determines the choice of abrasive grit when sanding primer surfacer before topcoat?

  1. The ambient noise level in the shop
  2. The recommended scratch pattern for the following coat's adhesion and coverage Correct answer.
  3. The colour of the topcoat being applied
  4. The age of the spray booth filters

Explanation

The grit used on primer determines the scratch depth and profile that the next coat must cover. Too coarse a scratch shows through the topcoat, while too fine a scratch can reduce mechanical adhesion. Manufacturer guidance specifies the appropriate grit sequence.

Question 24Core units

A technician is asked to refinish a panel where the existing clearcoat is peeling at the edges. What is the correct approach?

  1. Feather the peeled edge and seal it with clearcoat only
  2. Sand the loose edge lightly and apply basecoat directly over it
  3. Cover the peeling area with a decal to hide the defect
  4. Remove the unstable coating back to a sound edge and treat the area before refinishing Correct answer.

Explanation

Peeling clearcoat indicates a loss of adhesion that will continue to spread under new coatings. The unstable film must be removed back to sound material, then the area is prepared and primed before refinishing. Simply covering or feathering the edge does not restore adhesion.

Question 25Core units

Which statement correctly describes the function of a sealer in a refinish system?

  1. It adds the final gloss and UV protection
  2. It replaces the need for any surface preparation
  3. It fills deep dents in the panel
  4. It provides a uniform, sealed foundation that prevents solvent draw-through and improves topcoat holdout Correct answer.

Explanation

A sealer creates a uniform, closed foundation that limits solvent migration from the topcoat into underlying layers and improves holdout and colour uniformity. It does not replace surface preparation or provide final gloss. Deep fills are handled with body filler.

Question 26Core units

What is the primary purpose of a primer surfacer in a refinish system?

  1. To provide a smooth, sandable film that fills minor imperfections and promotes topcoat adhesion Correct answer.
  2. To protect bare metal from corrosion
  3. To provide the final colour and gloss
  4. To seal the substrate and prevent solvent penetration

Explanation

Primer surfacer is a high-build coating applied over prepared substrates to fill sanding scratches and minor surface irregularities, creating a smooth foundation for the topcoat. It also enhances adhesion between the substrate and subsequent coatings. Its sandable nature allows technicians to level the surface before applying colour.

Question 27Core units

Which abrasive grit range is typically used for final sanding of primer surfacer before applying a topcoat?

  1. P180 to P240
  2. P320 to P400 Correct answer.
  3. P600 to P800
  4. P80 to P120

Explanation

Final sanding of primer surfacer is usually done with P320 to P400 grit to remove imperfections and provide a fine scratch pattern that promotes topcoat adhesion without leaving deep scratches that could show through. Coarser grits like P80–P120 are for shaping body filler, while finer grits like P600–P800 are for sanding clearcoat or blending.

Question 28Core units

What is the recommended technique for mixing a two-component primer to ensure proper activation?

  1. Stir the components gently to avoid introducing air
  2. Add the activator to the base and mix thoroughly, scraping the sides and bottom of the container Correct answer.
  3. Shake the container vigorously for one minute
  4. Pour the activator into the base and stir slowly

Explanation

Proper mixing of two-component products requires adding the activator to the base and mixing thoroughly, including scraping the sides and bottom of the container to ensure all material is activated. Incomplete mixing can lead to poor cure, adhesion failure, or inconsistent finish.

Question 29Core units

Which spray gun adjustment controls the amount of material released when the trigger is pulled?

  1. Fan pattern adjustment
  2. Fluid needle adjustment Correct answer.
  3. Air cap selection
  4. Air pressure regulator

Explanation

The fluid needle adjustment, typically located at the rear of the gun, controls how far the needle opens when the trigger is pulled, thereby regulating the volume of material released. Air pressure affects atomisation, fan pattern controls shape, and air cap selection influences spray characteristics.

Question 30Core units

What is the purpose of a sealer in a refinish system?

  1. To provide a glossy finish
  2. To fill deep scratches
  3. To add colour to the panel
  4. To prevent solvent penetration and promote adhesion between layers Correct answer.

Explanation

A sealer is applied over prepared substrates or existing finishes to create a uniform barrier that prevents solvent penetration from subsequent coats and promotes adhesion. It also helps to isolate different coating types and can provide a consistent base for topcoat application.

Question 31Core units

Which of the following is a correct safety practice when handling refinish materials?

  1. Store solvents in open containers for easy access
  2. Wear nitrile gloves and safety glasses when mixing and spraying Correct answer.
  3. Use compressed air to dry hands after handling chemicals
  4. Work in a closed area to prevent drafts

Explanation

Personal protective equipment such as nitrile gloves and safety glasses is essential when handling refinish materials to prevent skin contact and eye exposure to chemicals. Proper ventilation and closed containers are also important safety measures.

Question 32Core units

What is the first step in preparing a bare metal panel for refinishing?

  1. Clean and degrease the surface Correct answer.
  2. Apply a primer surfacer
  3. Sand with P80 grit
  4. Apply a sealer

Explanation

Before any sanding or coating, the panel must be cleaned and degreased to remove contaminants such as oil, grease, and dirt that can interfere with adhesion. Skipping this step can lead to poor adhesion and finish defects.

Question 33Core units

Which factor most directly affects the drying time of a two-component primer?

  1. The mixing ratio of base to activator Correct answer.
  2. The type of spray gun used
  3. The humidity level
  4. The colour of the primer

Explanation

The mixing ratio of base to activator is critical for proper cure; an incorrect ratio can lead to extended drying time or incomplete cure. Temperature and humidity also affect drying, but the mixing ratio is a primary determinant.

Question 34Core units

A technician is spraying a basecoat and notices the finish has a rough, sandy texture. Which action is most appropriate?

  1. Add more reducer to the basecoat
  2. Stop, allow the coat to flash off, then sand and reapply Correct answer.
  3. Increase the fluid flow and reduce air pressure
  4. Continue spraying; the texture will flow out

Explanation

A rough, sandy texture indicates insufficient atomisation or improper spray technique, leading to dry spray. The best action is to stop, allow the coat to flash off, then sand the texture smooth and reapply with adjusted gun settings. Continuing to spray will not correct the texture and may worsen it.

Question 35Core units

What is the correct procedure for applying a primer surfacer over body filler?

  1. Sand the filler with P80, clean, then apply primer surfacer
  2. Apply a sealer first, then primer surfacer
  3. Sand the filler with P180, clean, then apply primer surfacer Correct answer.
  4. Apply directly over the filler without sanding

Explanation

Body filler should be sanded smooth with P180 grit before applying primer surfacer. This grit provides a good mechanical key for the primer while removing coarse scratches. Cleaning after sanding is essential to remove dust.

Question 36Core units

Which technique is best for avoiding overspray when spraying a panel adjacent to an unmasked area?

  1. Use a spray gun with a smaller fluid tip
  2. Mask the adjacent area and maintain proper gun distance and angle Correct answer.
  3. Reduce air pressure and increase fluid flow
  4. Use a slower hand speed and closer distance

Explanation

Overspray can be minimised by masking adjacent areas and maintaining the correct gun distance (typically 15–20 cm) and angle (perpendicular to the surface). Proper technique ensures the spray pattern is confined to the intended area.

Question 37Core units

What is the purpose of a flex additive in a plastic bumper refinish system?

  1. To increase the hardness of the finish
  2. To allow the coating to flex with the plastic without cracking Correct answer.
  3. To improve colour match
  4. To speed up the drying time

Explanation

Flex additive is added to the topcoat or clearcoat to impart flexibility, allowing the coating to move with the plastic bumper during minor impacts and temperature changes without cracking or peeling. It does not significantly affect hardness, drying time, or colour.

Question 38Core units

A technician is blending a basecoat into an adjacent panel. Which step is most critical to achieve a seamless blend?

  1. Sanding the blend area with P80 grit
  2. Applying a heavy coat of basecoat to hide the transition
  3. Using a blending solvent to melt the edges
  4. Feathering the basecoat with a reducer and allowing it to flash off Correct answer.

Explanation

Blending basecoat involves applying a reduced mixture of basecoat at the edge to gradually fade the colour into the adjacent panel. Feathering with reducer helps the transition, and proper flash-off time prevents solvent trapping.

Question 39Core units

What is the correct action if a technician notices a dry, oversprayed edge after applying clearcoat?

  1. Wipe the edge with solvent
  2. Apply more clearcoat over the dry edge
  3. Ignore it; it will level out
  4. Sand the edge with P1200 and polish Correct answer.

Explanation

A dry, oversprayed edge in clearcoat can be corrected by sanding with fine grit (P1200 or finer) and polishing to blend the area. Applying more clearcoat over dry overspray may not adhere properly and can worsen the texture.

Question 40Core units

Which factor is most important when selecting a reducer for a basecoat in high-temperature conditions?

  1. The drying time of the reducer Correct answer.
  2. The viscosity of the reducer
  3. The colour of the basecoat
  4. The brand of the spray gun

Explanation

In high-temperature conditions, a slower-drying reducer is typically used to prevent the basecoat from drying too quickly, which can cause dry spray and poor flow. The reducer's drying time is the critical factor.

Question 41Core units

What is the recommended method for cleaning a spray gun after use with two-component paint?

  1. Wipe the exterior with a rag and store
  2. Disassemble and soak in solvent, then clean passages with a brush Correct answer.
  3. Rinse with water and dry with compressed air
  4. Spray solvent through the gun until clean, then flush with air

Explanation

Two-component paints cure chemically and require thorough cleaning. Disassembling the gun and soaking components in solvent, then cleaning passages with a brush, ensures all residue is removed. Simply spraying solvent may not clean internal passages adequately.

Question 42Core units

Which statement best describes the function of an etch primer?

  1. It acts as a flexible additive for plastics
  2. It is used as a final topcoat for gloss
  3. It offers excellent corrosion protection and adhesion to bare metal Correct answer.
  4. It provides a high-build fill for sanding

Explanation

Etch primer contains an acid that etches into bare metal, providing excellent adhesion and corrosion protection. It is typically applied thinly over bare metal before other primers or topcoats.

Question 43Core units

A technician is repairing a panel with existing single-stage paint that is in good condition. What is the correct preparation before applying a new basecoat/clearcoat system?

  1. Clean, sand with P400, and apply sealer Correct answer.
  2. Apply basecoat directly over the single-stage paint
  3. Strip the single-stage paint to bare metal
  4. Sand the single-stage paint with P80 and apply sealer

Explanation

When refinishing over existing single-stage paint in good condition, the surface should be cleaned, sanded with P400 to promote adhesion, and sealed to provide a uniform base and prevent solvent interaction. Stripping to bare metal is unnecessary if the existing finish is sound.

Question 44Core units

What is the primary reason for using a tack cloth before applying a topcoat?

  1. To remove sanding dust and debris Correct answer.
  2. To add gloss to the finish
  3. To apply a thin layer of adhesion promoter
  4. To smooth the surface

Explanation

A tack cloth is used to remove fine dust and debris from the surface immediately before applying a topcoat. This prevents dust particles from being trapped in the finish, which can cause defects.

Question 45Core units

Which defect is most likely to occur if a sealer is applied too heavily and not allowed to flash off properly before topcoat?

  1. Orange peel
  2. Solvent pop Correct answer.
  3. Fish eyes
  4. Sags

Explanation

Applying a sealer too heavily and not allowing proper flash-off can trap solvent, which then escapes through the topcoat, causing solvent pop (small blisters or pinholes). Proper flash-off time allows solvents to evaporate before the next coat.

Question 46Core units

A technician is using a HVLP spray gun and notices the finish has a mottled, uneven appearance. Which adjustment is most likely to correct this?

  1. Reduce fan pattern
  2. Increase fluid flow
  3. Increase air pressure Correct answer.
  4. Decrease air pressure

Explanation

A mottled, uneven appearance with HVLP can result from insufficient air pressure for proper atomisation. Increasing air pressure (within the gun's recommended range) improves atomisation and creates a more uniform finish.

Question 47Core units

What is the correct procedure for storing unused two-component primer after mixing?

  1. Seal tightly and store indefinitely
  2. Add thinner to extend pot life
  3. Use within the pot life and discard any remaining product Correct answer.
  4. Store in an open container for easy access

Explanation

Mixed two-component primer has a limited pot life; after that time, it begins to cure and becomes unusable. It should be used within the pot life and any remaining product discarded properly.

Question 48Core units

Which test is commonly used to check for proper adhesion of a refinish coating?

  1. Wet film thickness gauge
  2. Colour match sprayout
  3. Cross-hatch adhesion test Correct answer.
  4. Orange peel meter

Explanation

The cross-hatch adhesion test involves cutting a grid pattern through the coating and applying tape to check if any coating lifts. It is a standard method for assessing adhesion quality.

Question 49Core units

A technician is diagnosing a finish that has small craters or fish eyes. Which of the following is the most likely source of contamination?

  1. Silicone or oil in the air lines Correct answer.
  2. Incorrect gun distance
  3. Too slow a reducer
  4. Excessive air pressure

Explanation

Fish eyes are typically caused by surface contamination with silicone, oil, or grease, which lowers surface tension and causes the coating to pull away. Contaminants can come from air lines, shop rags, or skin oils.

Question 50Core units

When blending clearcoat on a panel, what is the purpose of using a blending solvent?

  1. To speed up the curing of the new clearcoat
  2. To increase the gloss of the new clearcoat
  3. To clean the surface before spraying
  4. To soften the edge of the existing clearcoat and allow the new clearcoat to melt into it Correct answer.

Explanation

Blending solvent is applied to the edge of the existing clearcoat to soften it, allowing the new clearcoat to melt into the old finish and create a seamless transition. This technique avoids a visible edge.