ASE Practice Test (B2: Painting & Refinishing) — Questions and Answers
Question 1: Fish-eye defects are appearing in a freshly sprayed basecoat. The MOST likely cause is:
- Too much reducer in the paint mixture
- Silicone or oil contamination on the surface (Correct answer)
- Spraying in temperatures below 60°F (15°C)
- Excessive air pressure at the gun
Correct answer: Silicone or oil contamination on the surface
Fish-eyes are caused by silicone or oil contamination on the surface being painted. The paint cannot wet out over these contaminants and pulls away, forming circular craters. Proper surface cleaning and a fish-eye eliminator additive can help prevent this.
Question 2: A technician is mixing a two-stage urethane clearcoat. The manufacturer's ratio is 4:1:1 (clear:hardener:reducer). If 16 oz of clearcoat is used, how much hardener is needed?
- 2 oz
- 4 oz (Correct answer)
- 8 oz
- 16 oz
Correct answer: 4 oz
In a 4:1:1 ratio, for every 4 parts of clear, 1 part of hardener is required. With 16 oz of clearcoat: 16 ÷ 4 = 4 oz of hardener. Mixing ratios must be followed precisely to ensure proper cure, hardness, and gloss.
Question 3: When color sanding a clearcoat, the technician notices sand scratches remain visible after polishing. The MOST likely cause is:
- Using too fine a polishing compound
- Starting with sandpaper that is too coarse (Correct answer)
- Insufficient film thickness of the clearcoat
- Using a DA polisher at too low a speed
Correct answer: Starting with sandpaper that is too coarse
Starting with sandpaper that is too coarse leaves deep scratches that require progressively finer grits to remove. If the technician skips grades or the coarse scratches are not fully removed before moving to finer sandpaper, they will remain visible after polishing.
Question 4: A vehicle is being spot-repaired. The technician must blend the new color into the adjacent panels. The PRIMARY reason for blending is:
- To avoid runs and sags in the new paint
- To compensate for metamerism and color shift with age (Correct answer)
- To reduce the amount of paint used in the repair
- To eliminate the need for a clearcoat topcoat
Correct answer: To compensate for metamerism and color shift with age
Blending is required because paint changes color slightly as it ages and weathers. Metamerism (color shift under different lighting) also plays a role. By feathering new paint into adjacent panels, the transition is made invisible even if a slight color difference exists.
Question 5: Which respirator type provides the BEST protection when spraying isocyanate-based (urethane) paints?
- Dust/particulate mask rated N95
- Half-mask respirator with organic vapor cartridges only
- Supplied-air respirator (SAR) or PAPR with combination cartridges (Correct answer)
- Half-mask with P100 particulate filters only
Correct answer: Supplied-air respirator (SAR) or PAPR with combination cartridges
Isocyanates are highly hazardous sensitizers. OSHA and manufacturers recommend a supplied-air respirator (SAR) or powered air-purifying respirator (PAPR) with combination organic vapor and particulate filters for maximum protection. Standard organic vapor cartridges alone are insufficient.
Question 6: A technician notices orange peel texture in a cured clearcoat. Technician A says this can be corrected by wet sanding and polishing. Technician B says orange peel is caused by excessive flash time between coats. Who is correct?
- Technician A only (Correct answer)
- Technician B only
- Both Technician A and Technician B
- Neither Technician A nor Technician B
Correct answer: Technician A only
Technician A is correct — orange peel in cured clearcoat can be corrected by color sanding with progressively finer grits followed by machine polishing. Technician B is incorrect; orange peel is typically caused by insufficient flash time, incorrect gun setup, or too-fast evaporating reducer — not excessive flash time.
ASE Practice Test (B2: Painting & Refinishing)
Fish-eye defects are appearing in a freshly sprayed basecoat.
The MOST likely cause is: