20 Application Technique Problems Practice Questions & Answers

1. 1. A painter sprays a metallic solventborne basecoat on a hot afternoon in a booth with strong airflow. The finish comes out rough and sandy with low gloss, and the metallic looks grainy and lighter than expected. What is the most likely cause?

   • A.The reducer was too fast for the booth temperature, so droplets dried before landing✓ Answer
   • B.The gun was held too close to the panel, so too much material reached the surface
   • C.The reducer was too slow for the booth temperature, so the film stayed open too long
   • D.The fluid knob was opened too far, so the gun delivered more paint than it could atomize

   Dry spray forms when atomized droplets lose their solvent before they reach the panel and cannot flow together. A reducer that evaporates too quickly for a hot, high-airflow booth does exactly that, so the cure is a slower reducer suited to the temperature, correct gun distance and medium-wet coats. A slow reducer, a close gun or excess fluid all make the film wetter, which leads to sags or mottling rather than a sandy surface.

   Ref QB-XPXM5FSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (dry spray: identify, determine causes, correct the condition); paint manufacturer technical data sheet reducer-selection practiceReport a problem with this question

2. 2. A painter notices dry spray in a metallic basecoat on a door before any clear has been applied. Painter A says to let it flash and apply a wetter orientation coat of base so the surface is uniform before clearing. Painter B says to go ahead and apply an extra-heavy first coat of clear to bury the dry spray. Who is right?

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

   Dry spray in the base is corrected in the base: once it flashes, a wetter orientation (control) coat re-wets the rough particles and lays the metallic evenly. Clear cannot reliably bury dry spray; the rough texture and grainy, light-looking metallic remain visible under the clear, and an extra-heavy clear coat also invites sags and solvent entrapment. So only Painter A is right.

   Ref QB-F75TQFSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (dry spray: correct the condition); paint manufacturer basecoat application instructionsReport a problem with this question

3. 3. All of these could cause dry spray when applying basecoat EXCEPT:

   • A.Moving the gun faster across the panel than the technique requires
   • B.Using less overlap between passes than the paint maker recommends
   • C.Using a slower reducer than the TDS recommends for the booth temperature✓ Answer
   • D.Holding the gun farther from the panel than the gun maker recommends

   Excess distance, excess gun speed and too little overlap all deliver too little wet material, so droplets arrive half-dry and the film turns rough and sandy. A reducer slower than recommended does the opposite: it keeps the film wet longer, which tends toward sags, runs or mottling, not dry spray. A reducer that is too fast is the one that causes dry spray.

   Ref QB-YPAYAGSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (dry spray: determine the causes); I-CAR refinish training principles on spray techniqueReport a problem with this question

4. 4. After the second coat of a silver metallic basecoat on a hood, the painter sees blotchy light and dark patches across the panel. No clear has been applied yet. What is the best correction?

   • A.Apply a heavier, wetter third coat so the flake floats into an even layer
   • B.Wet sand the uncleared base with fine grit, then apply the clear over it
   • C.Apply the clear right away, since the clear will even out the flake pattern
   • D.Let the base flash, then apply an even orientation coat as the TDS directs✓ Answer

   Mottling is uneven flake orientation. While the base is still uncleared, letting it flash and then applying an even orientation (drop or control) coat re-aligns the flake into a uniform pattern. Clear locks the mottling in place rather than fixing it, a heavier, wetter coat lets more flake float and puddle, which is a cause of mottling, and sanding uncleared base disturbs the flake further.

   Ref QB-G7G5WGSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (mottling or streaking in metallic, mica and effect finishes: correct the condition); paint manufacturer basecoat technical data sheetReport a problem with this question

5. 5. A metallic basecoat on a quarter panel shows straight bands of light and dark color that follow the direction of the gun passes. What is the most likely cause?

   • A.A reducer that is slightly too fast, which makes all the flake lie flat
   • B.Too much booth airflow, pulling the overspray toward the exhaust filters
   • C.Inconsistent overlap between passes, leaving bands of uneven film thickness✓ Answer
   • D.Straining the paint before use, which removes some of the metallic flake

   Streaking (striping) follows the gun path because each pass deposits a band of film; when overlap varies, the overlapped strips are wetter and the gaps drier, and the metallic orients differently in each. Booth airflow does not lay down bands that follow the gun path, normal straining does not remove metallic flake, and a uniformly fast reducer affects the whole panel evenly rather than in stripes.

   Ref QB-ZPNAGHSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (mottling or streaking in metallic, mica and effect finishes: determine the causes); I-CAR refinish training principles on overlapReport a problem with this question

6. 6. A customer returns a car with visible mottling in a metallic finish that was base-and-cleared last week, and the clear is fully cured. Painter A says machine compounding and polishing the clear will remove the mottling. Painter B says the panel must be sanded and refinished with basecoat and clear. Who is right?

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

   Mottling lives in the basecoat, in how the metallic flake is oriented, not on the surface of the clear. Compounding only levels the clear, so it cannot change flake orientation underneath. Once the clear is on, the correction is to sand and reapply basecoat and clear with correct technique, so only Painter B is right.

   Ref QB-H7UF3JSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (mottling or streaking: correct the condition); paint manufacturer refinish troubleshooting guidance on mottlingReport a problem with this question

7. 7. A refinished fender has excessive orange peel in the cured 2K urethane clearcoat compared with the adjacent door, and there is plenty of clear film to work with. Painter A says to wet sand the clear with a fine grit and then compound and polish it. Painter B says the only proper repair is to sand the clear with a coarse grit and reclear the whole panel. Who is right?

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

   When the clear has enough film build, excessive orange peel is removed by leveling the texture: wet sanding with a fine grit followed by compounding and polishing. Coarse grit and a full reclear are reserved for severe peel or for clear too thin to sand safely, so they are not the only proper repair here. Only Painter A is right.

   Ref QB-2QZMNJSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (excessive or lack of texture, orange peel: correct the condition); ASE B2 sample question on orange peel removalReport a problem with this question

8. 8. Which of these is most likely to cause heavy orange peel in a freshly sprayed clearcoat?

   • A.A gun held closer than recommended, so the clear goes on as a wetter film
   • B.Air pressure set above the gun maker's spec, so the clear breaks into fine mist
   • C.A reducer slower than the TDS calls for, so the clear stays wet for longer
   • D.Air pressure set below the gun maker's spec, so the clear is poorly atomized✓ Answer

   Orange peel is droplets that are too large or too thick to coalesce and level. Air pressure below spec atomizes the clear into large droplets that cannot flow out, leaving a pebbled texture. Higher pressure, a slower reducer and a closer gun all make the film finer or wetter, which reduces texture and, if overdone, leads to dry spray or sags instead.

   Ref QB-A7C5V9Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (excessive or lack of texture, orange peel: determine the causes); paint manufacturer troubleshooting guidance on orange peelReport a problem with this question

9. 9. A painter's refinished fender comes out glass-smooth, while the adjacent OEM door has a noticeable factory texture, and the difference is obvious. Which adjustment would best help the next repair match the OEM texture?

   • A.Apply medium-wet coats at the proper distance to build a texture like the door✓ Answer
   • B.Switch to a slower reducer so the clear has more time to flow out flat
   • C.Apply heavier, wetter coats so the clear levels out even more smoothly
   • D.Raise the air pressure and move the gun closer to lay the clear on wetter

   On a repair the goal is to match the adjacent OEM texture, not to make the panel as smooth as possible. Too little texture comes from coats that are too wet or heavy, a slow reducer, or high pressure combined with a close gun. Medium-wet coats at the proper distance build a texture closer to the factory finish, while the other three changes make the film even wetter and smoother.

   Ref QB-TPHAFASource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (excessive or lack of texture, orange peel: determine the causes and correct the condition)Report a problem with this question

10. 10. While spraying clear on a vertical door panel, a painter sees a curtain-like sag starting to form where each pass ends near the door edge. Which change in technique should the painter make on the remaining passes?

    • A.Slow the gun down at the panel edge so the film there matches the rest of the door
    • B.Release the trigger at the panel edge instead of pausing with the gun still on the panel✓ Answer
    • C.Open the fluid knob slightly so each pass lays on a more even film along the edge
    • D.Move the gun closer at the panel edge so the fan is narrower and easier to control

    A sag that forms where passes end means material is piling up there, usually because the gun slows, pauses or reverses while still triggered over the panel. Triggering off at the panel edge stops the double-loading. Slowing down, moving closer or opening the fluid knob all put even more material on that spot, which makes the sag worse.

    Ref QB-9T7CV8Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (sags and runs as they form during spraying: correct the technique); I-CAR refinish training principles on triggeringReport a problem with this question

11. 11. On a cold morning, runs keep forming on the vertical panels while a painter sprays a solventborne clear. Painter A says the reducer may be too slow for the shop temperature. Painter B says the fluid control knob may be open too far for the gun speed being used. Who is right?

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

    Runs form when too much material, or material too fluid to hold, sits on a vertical surface. A reducer too slow for a cold shop keeps the clear fluid for too long, and an over-opened fluid knob delivers more material than the gun speed can spread. Both conditions cause runs, so both painters are right; the fix is a reducer matched to the temperature and the fluid set to suit the gun speed.

    Ref QB-RA27A8Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (sags and runs as they form during spraying: determine the causes); paint manufacturer technical data sheet reducer-selection practiceReport a problem with this question

12. 12. All of these could cause sags or runs to form during spraying EXCEPT:

    • A.Spraying with a faster reducer than the TDS recommends for the booth temperature✓ Answer
    • B.Spraying with an air pressure set below spec, which leaves heavy, wet droplets
    • C.Spraying when the material and panel are colder than the TDS minimum temperature
    • D.Spraying the next coat before the previous coat has fully flashed as the TDS requires

    Skipping flash time, spraying cold material on a cold panel, and low air pressure all leave too much wet, fluid material on the surface, which is what sags and runs are. A reducer faster than recommended evaporates sooner and makes the film set up drier, which tends toward dry spray or orange peel rather than runs.

    Ref QB-8TUZP7Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (sags and runs as they form during spraying: determine the causes)Report a problem with this question

13. 13. A silver metallic repair on a door looks darker than the adjacent fender, and the formula has been verified as correct. Painter A says moving the gun closer to the panel will make the repair lighter. Painter B says switching to a slower reducer will make the repair lighter. Who is right?

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

    In metallics, a wetter application makes the color darker and a drier application makes it lighter. A closer gun and a slower reducer both make the film wetter, letting the flake sink and tumble, so both changes would darken a repair that is already too dark. To lighten it, the painter would apply drier, for example with slightly greater distance, a faster reducer or a longer flash time, so neither painter is right.

    Ref QB-QAPU47Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (color mismatch due to application variables: determine the causes and correct the condition)Report a problem with this question

14. 14. A gold metallic spray-out made with the correct formula comes out lighter than the vehicle. Which application change would make the color darker?

    • A.Raising the air pressure slightly so the metallic breaks up finer
    • B.Lengthening the flash time so each coat dries more before the next
    • C.Shortening the gun distance slightly so each coat goes on wetter✓ Answer
    • D.Switching to a faster reducer so the basecoat sets up more quickly

    Wetter application darkens a metallic because the flake has time to sink and tumble instead of lying flat near the surface. A slightly shorter gun distance puts the coat on wetter, so it darkens the face. Higher pressure, a longer flash time and a faster reducer all make the application drier, which lightens the color further.

    Ref QB-BTWZ7BSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (color mismatch due to application variables: gun distance, air pressure, reducer speed, flash time)Report a problem with this question

15. 15. A painter's spray-out card matched the car, but the painted fender is noticeably darker. On the card the painter used quick, light passes; on the fender the painter used slower, wetter passes. What is the best first step?

    • A.Respray the fender with the same technique that was used on the spray-out card✓ Answer
    • B.Apply extra coats of clear to raise the gloss and lighten the face of the fender
    • C.Remix the formula from a lighter variant chip and respray the fender with it
    • D.Add white tint to the formula so the fender color comes out lighter on the respray

    The formula already matched when sprayed one way; the mismatch came from spraying the fender wetter, which darkens a metallic. The spray-out is only valid when it is made with the same technique used on the vehicle, so the first step is to correct the technique, not the formula. Tinting or switching variants would chase an application error with a formula change, and extra clear does not lighten the base color.

    Ref QB-TARUMASource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (color mismatch due to application variables; spray-out/let-down panel practice)Report a problem with this question

16. 16. A tri-coat pearl white let-down panel matched the vehicle with two mid-coats, but the painter applied four mid-coats on the repair. What is the most likely result?

    • A.No color change, since the pearl mid-coat is clear and adds no color at all
    • B.A shade shift away from the match, since mid-coat count changes the color✓ Answer
    • C.A gloss change only, since extra mid-coats reduce the clearcoat film build
    • D.No color change, since extra mid-coats only improve hiding of the ground coat

    In a tri-coat, the translucent pearl mid-coat builds color with each coat, which is why the let-down panel is used to find the number of mid-coats that matches. Applying more mid-coats than the matching step shifts the shade away from the vehicle. The mid-coat is not colorless, its role is not merely hiding, and its coat count does not set the clearcoat film build.

    Ref QB-ATJP2ASource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (color mismatch due to application variables: number of coats); tri-coat let-down panel practiceReport a problem with this question

17. 17. All of these application changes tend to make a metallic basecoat look LIGHTER EXCEPT:

    • A.Increasing the gun distance within the gun maker's recommended range
    • B.Increasing the number of wet coats beyond what the spray-out panel had needed✓ Answer
    • C.Increasing the gun speed while keeping the overlap at the same percentage
    • D.Increasing the air pressure at the gun within the gun maker's spec

    Higher pressure, greater distance and faster gun speed all deliver a drier film, so the flake lies flat near the surface and the face looks lighter. Adding extra wet coats is a wetter, heavier application that lets the flake sink and tumble, so it tends to darken the color and shifts it away from the spray-out.

    Ref QB-SADHF9Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (color mismatch due to application variables: gun distance, air pressure, wetness, number of coats)Report a problem with this question

18. 18. A painter applies a bright red basecoat over a repair, and after the number of coats the painter usually uses, the outline of the repair still shows through. Which step would best prevent this on the next job?

    • A.Apply the basecoat in drier coats so that each coat builds a little more hiding
    • B.Apply extra coats of clear, since the clear adds hiding over the base
    • C.Add extra reducer so that the basecoat flows out and covers more evenly
    • D.Use the undercoat value shade the paint maker recommends for that color✓ Answer

    Reds and other low-hiding colors need a matching undercoat value (gray shade) to reach hiding in a normal number of coats. Using the paint maker's recommended value shade makes the undercoat and repair outline disappear sooner. Drier coats and extra reduction thin the film and reduce hiding, and clearcoat is transparent and adds no hiding.

    Ref QB-5TSZ64Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (poor hiding/lack of coverage: determine the causes and correct the condition); paint manufacturer undercoat value-shade recommendationsReport a problem with this question

19. 19. A metallic basecoat that sat on the shelf for several days gives poor coverage, and sanding marks show through the first coats. Painter A says the base may not have been stirred, so the pigment and flake settled to the bottom. Painter B says a hiding sticker on a spray-out card can show how many coats are needed for full coverage. Who is right?

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

    Pigment and metallic flake settle when base sits, so unstirred material sprays thin on color and hides poorly; stirring or agitating it is part of the cure. A black-and-white hiding sticker on a spray-out card shows exactly when the film reaches full hiding, which tells the painter how many coats the car needs. Both painters are right.

    Ref QB-MAMUK3Source: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (poor hiding/lack of coverage: determine the causes and correct the condition); spray-out card practiceReport a problem with this question

20. 20. After a blue basecoat and 2K clear have fully cured, the painter notices that gray primer is faintly visible through the color in one area of the panel. What is the correct repair?

    • A.Apply two more coats of clear over the area to deepen the color and hide it
    • B.Spray a tinted clear over the area so the color covers the primer showing
    • C.Compound and polish the clear over the area to remove the visible primer
    • D.Sand the area and reapply basecoat to full hiding, then apply new clear✓ Answer

    Poor hiding is a shortage of basecoat film, and once clear is on, the base under it cannot be added to. The panel must be sanded and the base reapplied until it fully hides, followed by fresh clear. More clear or tinted clear does not supply the missing basecoat hiding and changes the color, and polishing only works the surface of the clear.

    Ref QB-CV7HDCSource: ASE Collision Repair and Refinish Study Guide, Test B2 Painting and Refinishing task list (poor hiding/lack of coverage: correct the condition)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 →