ASE Practice Test (B2: Painting & Refinishing)

Question 1

Fish-eye defects are appearing in a freshly sprayed basecoat. The MOST likely cause is:

Accepted Answer

Silicone or oil contamination on the surface

Answer

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?

Accepted Answer

4 oz

Answer

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:

Accepted Answer

Starting with sandpaper that is too coarse

Answer

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:

Accepted Answer

To compensate for metamerism and color shift with age

Answer

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?

Accepted Answer

Supplied-air respirator (SAR) or PAPR with combination cartridges

Answer

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.