20 Spray Technique & Coats Practice Questions & Answers

1. 1. Painter A says the spray gun should be held perpendicular to the surface at a constant distance throughout each pass for even film build. Painter B says the gun should be arced at the end of each pass, pivoting at the wrist, so the coat feathers out smoothly. Who is right?

   • A.Both A and B
   • B.A only✓ Answer
   • C.B only
   • D.Neither A nor B

   Painter A is right. Arcing the gun changes both the angle and the distance at the ends of the pass, so the film goes on thin at the ends and heavy in the middle, which causes uneven film build and striping. A perpendicular gun at a steady distance and speed lays down an even film.

   Ref QB-VCH45ZSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (spray gun technique: arc, angle, distance, speed and spray pattern overlap)Report a problem with this question

2. 2. A painter sprays a metallic silver basecoat on a door. The test panel matched, but on the door the painter held the gun closer and moved more slowly, and the door now looks darker than the adjacent fender. What technique change should be made on the next coat before any tinting is considered?

   • A.Switch to a slower-evaporating reducer so the coat flows out more evenly
   • B.Hold the gun a bit farther away and move faster so the coat goes on drier✓ Answer
   • C.Keep the same gun technique and add white toner to lighten the formula
   • D.Hold the gun a bit closer and move slower so the flakes settle and brighten

   A wetter application lets metallic flakes sink and lie unevenly in the film, so the color looks darker; a drier application keeps the flakes near the surface and looks lighter. Because the darkening came from a closer, slower (wetter) technique, the cure is to go drier with more distance and speed. Tinting is a last resort once technique matches the test panel, and a slower reducer would make the coat even wetter and darker.

   Ref QB-DVP9QZSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (spray gun technique; color match affected by application variables)Report a problem with this question

3. 3. After a metallic basecoat is applied, the panel shows light and dark stripes running in the direction of the spray passes. What is the most likely cause?

   • A.Too little hardener in the basecoat, which made it cure unevenly in bands
   • B.Uneven pass overlap and a tilted gun, which varied the film thickness✓ Answer
   • C.Banding the edges and openings first, which put extra film on each pass
   • D.The final control coat, which lined the metallic flakes up along each pass

   Striping in a metallic is a film-thickness problem: when the overlap varies or the gun is tilted, some strips get more material than others, and the flakes in the wetter strips lie darker. Banding edges first is normal procedure, and a control coat is the cure for striping, not its cause.

   Ref QB-WCVEA2Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (spray gun technique; mottling and striping in metallic finishes)Report a problem with this question

4. 4. All of these are correct spray gun techniques when applying a full coat of basecoat or clearcoat EXCEPT:

   • A.Holding the gun perpendicular at a steady distance and travel speed
   • B.Easing off the trigger partway mid-panel to lighten the coat in heavy spots✓ Answer
   • C.Pulling the trigger before the panel edge and releasing it past the far edge
   • D.Overlapping each pass by about half of the spray pattern's full width

   Feathering the trigger in the middle of a panel changes fluid delivery mid-pass and leaves uneven film and blotches; the gun is triggered fully at the start and end of each pass, off the panel. Half-pattern overlap and a perpendicular gun at constant distance and speed are standard full-coat technique.

   Ref QB-EV2MV2Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (spray gun technique: arc, angle, distance, speed and spray pattern overlap)Report a problem with this question

5. 5. Painter A says banding the edges, openings and panel ends first, then making the main passes, helps get full coverage in hard-to-reach areas. Painter B says holding the gun too far away and moving it too fast tends to cause dry spray and orange peel. Who is right?

   • A.Neither A nor B
   • B.B only
   • C.A only
   • D.Both A and B✓ Answer

   Both are right. Banding hard-to-reach edges first gets coverage there without overloading the main passes. Too much distance or speed lets the atomized paint lose solvent before it lands, so it cannot flow out, which produces dry spray and orange peel; too close or too slow does the opposite and causes runs.

   Ref QB-XC8SF3Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (spray gun technique; dry spray and orange peel caused by application technique)Report a problem with this question

6. 6. A painter has just applied the last coat of basecoat and is ready for clearcoat. When should the clearcoat be applied?

   • A.While the last base coat still looks wet and glossy, so the clear bonds into it
   • B.When a light finger touch on the base leaves no mark, to confirm that it is dry
   • C.After the base has cured overnight and been scuffed, so the clear has some tooth
   • D.Once the base has flashed to a uniform dull look, within the TDS recoat window✓ Answer

   Basecoat is cleared once it has flashed to an even dull (matte) look and before the recoat window on the technical data sheet (TDS) expires. Clearing a base that is still wet traps solvent and leads to solvent popping or die-back, while waiting past the window can cost intercoat adhesion. Touching the base can leave marks and contamination.

   Ref QB-FVDX24Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply basecoat; flash between coats per the manufacturer's technical data sheet)Report a problem with this question

7. 7. A painter applies a silver metallic basecoat to full hiding, but the panel looks blotchy, with uneven light and dark patches. What should be done before clearcoat?

   • A.Apply the clearcoat right away, since the clear evens out a blotchy metallic
   • B.Sand the base with fine paper and polish it smooth before applying the clear
   • C.Apply a heavier wet coat from closer range so the flakes can flow out and level
   • D.Apply a lighter control coat with more overlap to even out flake orientation✓ Answer

   Mottling in a metallic comes from uneven flake orientation. A final control (drop or orientation) coat, applied lighter, often from a little more distance with more overlap, settles the flakes evenly and removes the blotches. A heavier wet coat makes mottling worse, and clearcoat locks in whatever pattern the base has.

   Ref QB-YCK4N4Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply basecoat and multi-stage coats; control coats for metallics)Report a problem with this question

8. 8. A painter is refinishing a three-stage pearl white. Painter A says the pearl mid-coat should stop inside the ground-coat area so the pearl always sits over full hiding. Painter B says the number of mid-coats sets the final color, so a let-down panel should be sprayed first to choose the coat count. Who is right?

   • A.B only✓ Answer
   • B.Both A and B
   • C.A only
   • D.Neither A nor B

   Only Painter B is right. In a tri-coat the translucent mid-coat changes the color with every coat, so a let-down panel is sprayed to find the coat count that matches the vehicle. The mid-coat is blended out farther than the ground coat, not stopped inside it, so the pearl effect fades gradually into the existing finish.

   Ref QB-GVR985Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply multi-stage coats; mid-coat for tri-coat; let-down panels)Report a problem with this question

9. 9. A painter is refinishing a repaired front door in a metallic color. The let-down panel shows the mixed color is close but not an exact match to the adjacent panels. What is the best refinish plan?

   • A.Refinish the entire vehicle overall so that every panel receives the same new color
   • B.Bring color to hiding on the repair only and keep the base inside the door as a spot
   • C.Bring color to hiding on the repair, then blend the base into the fender and rear door✓ Answer
   • D.Bring color to hiding on the whole door and stop the base sharply at the door edges

   When the color is close but not exact, the industry norm is to put color to hiding over the repair and blend the basecoat progressively onto the adjacent panels so the eye cannot find a color break. Butting color at the door edge makes the small difference obvious, a spot repair inside the door has the same problem, and an overall refinish is unnecessary for a single-panel repair.

   Ref QB-ZCXET5Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply basecoat for spot, panel, blend and overall refinishing; blending onto adjacent panels)Report a problem with this question

10. 10. While a metallic basecoat is still within its recoat window, a painter lightly sands out several dirt nibs in it. What should be done next?

    • A.Apply another coat of basecoat over the area so the sand scratches do not show✓ Answer
    • B.Apply the clearcoat directly, since the clear will fill and hide the sand scratches
    • C.Polish the sanded base with fine compound to restore the flake before clearing
    • D.Wipe the area with reducer to melt the scratches before applying the clearcoat

    Sanding a metallic base disturbs the flake and leaves scratches that clearcoat magnifies rather than hides. A fresh coat of basecoat over the sanded area restores uniform flake orientation and color before clearing. Basecoat has no gloss of its own to polish, and wiping with reducer smears and disturbs the film.

    Ref QB-6CJQ2ESource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply basecoat; official sample item on recoating sanded metallic base before clear)Report a problem with this question

11. 11. Painter A says basecoat flash time between coats is fixed, so the same wait can be used no matter the booth temperature or humidity. Painter B says clearcoat can go on while the basecoat still looks glossy as long as the first clear coat is light. Who is right?

    • A.Both A and B
    • B.A only
    • C.Neither A nor B✓ Answer
    • D.B only

    Neither is right. Flash time follows the technical data sheet and changes with temperature, humidity and airflow, so the painter also judges by the base turning uniformly dull. A base that still looks glossy has not flashed, and clearing it, even lightly, traps solvent that can cause solvent popping or die-back.

    Ref QB-NUCJFDSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (flash between coats per the manufacturer's technical data sheet)Report a problem with this question

12. 12. All of these are sound practices when blending a metallic basecoat into an adjacent panel EXCEPT:

    • A.Finishing with a light control coat to even out the flake in the blend zone
    • B.Extending each later coat a little farther into the panel than the one before
    • C.Stopping every coat at the same line so the edge of the blend stays crisp✓ Answer
    • D.Wetting the blend area first with blending clear when the TDS calls for it

    A blend works because each coat is spread progressively farther than the last, so the color change is gradual and invisible. Stopping every coat at the same line builds a hard edge that shows as a color break. Pre-wetting with blending clear where the system calls for it and a light final control coat both help the metallic lay down evenly in the blend.

    Ref QB-5C7DVCSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply basecoat for blending; blend-within-panel and onto adjacent panels)Report a problem with this question

13. 13. A painter must blend clearcoat on a quarter panel where it joins the sail panel (C-pillar area). What is the recommended way to finish the clear?

    • A.Clear only the repaired area of the quarter panel and polish the dry edge later
    • B.Extend the masking and the clear to the nearest panel edge or natural breakpoint✓ Answer
    • C.Blend the clear in the middle of the sail panel with a fade-out solvent blender
    • D.Apply one heavy coat of clear over the base blend area so that less edge forms

    Clear blended in the middle of a panel leaves a thin edge that can lose adhesion or show a halo, so the clear is carried to the nearest panel edge or natural breakpoint, where the edge is hidden and durable. Polishing a dry clear edge does not make it last, and one heavy coat risks runs and solvent popping.

    Ref QB-MUZ7ACSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply clearcoat; official sample item on extending clear to the nearest panel edge or breakpoint)Report a problem with this question

14. 14. Painter A says the clearcoat should extend beyond the area covered by the basecoat blend. Painter B says applying too little clear leaves poor gloss and durability and no film to sand and buff out defects. Who is right?

    • A.Neither A nor B
    • B.A only
    • C.Both A and B✓ Answer
    • D.B only

    Both are right. Basecoat has no protection or gloss of its own, so every bit of blended base must be covered by clear that runs past it. Full wet coats, usually two with flash between per the TDS, give the gloss, UV protection and film thickness needed to wet-sand and buff later.

    Ref QB-8C9DDGSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply clearcoat: full wet coats, blending clear)Report a problem with this question

15. 15. Why do paint manufacturers generally discourage blending clearcoat in the middle of a panel?

    • A.The thin clear edge can lose adhesion, show a halo, or fail over time✓ Answer
    • B.A clear blend traps base solvent so that the base can never flash off
    • C.A clear blend needs flex additive in the clear, which dulls the gloss
    • D.The clear edge cures harder than the panel and cracks the base below it

    At a clear blend the film tapers to almost nothing, so that edge has little build, weak adhesion and poor UV resistance; it can show a halo, peel or fail as it ages. That is why the preferred practice is to carry clear to a panel edge or breakpoint, using a blending clear or solvent blender only when a blend cannot be avoided.

    Ref QB-QU38TFSource: Paint manufacturer technical data sheet practice for blending clearcoat; ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (blending clear, breaking at a panel edge or breakpoint)Report a problem with this question

16. 16. All of these are correct when applying a two-component (2K) urethane clearcoat EXCEPT:

    • A.Allowing flash time between clear coats as the TDS directs
    • B.Wearing supplied-air or other approved isocyanate respirators
    • C.Mixing the clear with hardener at the ratio stated on the TDS
    • D.Applying the clear before the base flashes so both cure as one✓ Answer

    Clearcoat goes on only after the basecoat has flashed; clearing a wet base traps solvent and causes solvent popping and die-back. The correct hardener ratio prevents a soft film, flash between coats prevents runs and trapped solvent, and 2K clears contain isocyanates that require proper respiratory protection, with supplied air recommended.

    Ref QB-7CW28FSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (apply clearcoat); OSHA 29 CFR 1910.134 Respiratory ProtectionReport a problem with this question

17. 17. A painter is refinishing a new, unprimed polypropylene (PP) bumper cover. What should be applied to the raw plastic before the primer or sealer?

    • A.An adhesion promoter for plastics, after cleaning and scuffing the part✓ Answer
    • B.A polyester finishing putty, skimmed over the whole part for tooth
    • C.An epoxy primer, applied straight to the plastic without cleaning
    • D.A self-etching primer, after cleaning and scuffing it like bare steel

    Polyolefin plastics such as PP and TPO have low surface energy, so coatings do not stick to them without an adhesion promoter. The part is first cleaned with plastic cleaner and scuffed with a fine scuff pad. Self-etching primer is designed to etch bare metal, not plastic, and skipping cleaning leaves mold release agents that cause adhesion loss.

    Ref QB-PUQVMESource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (refinish trim components; official sample item on adhesion promoter for plastic parts)Report a problem with this question

18. 18. Painter A says flex additive and adhesion promoter do the same job, so either one can be used on a raw TPO bumper cover. Painter B says raw polyolefin plastics such as PP and TPO usually need an adhesion promoter before priming. Who is right?

    • A.Both A and B
    • B.A only
    • C.Neither A nor B
    • D.B only✓ Answer

    Only Painter B is right. Adhesion promoter makes coatings stick to low-energy raw polyolefin plastic, while flex additive is mixed into primer, base or clear (as the system specifies) so the cured film can bend with a flexible part without cracking. They solve different problems, and a flexible bumper may need both.

    Ref QB-ACY2RJSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (refinish trim components: flexible plastic parts, flex additive, adhesion promoter)Report a problem with this question

19. 19. A painter must refinish a textured, low-gloss exterior mirror housing to match its original appearance. Which approach is correct?

    • A.Recreate the texture with a texture coating, then match gloss with flattened clear✓ Answer
    • B.Sand the texture flat for adhesion, then apply the same full-gloss clear as the body
    • C.Apply high-gloss clear directly over the textured plastic to seal and protect it
    • D.Fill the texture with primer-surfacer, block it smooth, then apply a satin base

    Textured trim must look like the original in both texture and gloss. A texture coating or additive reproduces the grain, and a trim paint or clear with flattening agent brings the sheen down to the OEM low-gloss level. Sanding or filling the texture smooth, or using full-gloss clear, leaves a part that looks different from the rest of the trim.

    Ref QB-SUSV5JSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (refinish interior and exterior trim components; textured trim)Report a problem with this question

20. 20. A new replacement bumper cover arrives already coated with factory primer. How should the painter prepare it for color?

    • A.Spray basecoat right over the factory coating without any cleaning or scuffing
    • B.Sand through the factory coating with coarse paper so base bites into plastic
    • C.Do a solvent rub test on the coating, then clean, scuff and seal it before color✓ Answer
    • D.Strip the factory coating to bare plastic, then apply promoter and base

    A solvent rub test shows whether the factory coating is a sound, cured primer or a soft transport coating that must be removed. A sound coating is kept, cleaned, scuffed and sealed, because stripping it or sanding through it wastes the factory protection and exposes raw plastic. Spraying over it uncleaned risks adhesion loss from mold release and handling contamination.

    Ref QB-9EJVJHSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (refinish trim components: flexible plastic parts)Report a problem with this question

Practice questions based on the Official ASE Study Guide task list for the Painting and Refinishing (B2) test. This site is not affiliated with or endorsed by ASE, and these are not real exam questions. ASE revises its task lists periodically and sets the test length, passing standard and certification requirements, including the hands-on experience required for certification, which is separate from registering for the test. Mix ratios, flash and bake times, film builds and gun settings come from each product's own technical data sheet and are deliberately not tested here; VOC and emission rules are set federally and may be stricter in your state or air district. Confirm the current study guide and the rules that apply where you work. Official ASE B2 test page →