1. The newly sprayed paint layer is forced to dry too quickly, or the temperature in the HVLP car painting workshop is too high, and the surface paint dries quickly and shrinks, which will delay the drying speed of the inner paint.
2. There are too many spraying passes of HVLP car painting, and the paint film is too thick; the leveling time between each paint layer is insufficient.
3. The wrong thinner is used. In automotive paint, if you use a high-volatile paint thinner, when the paint is in a dry state, the surface of the paint film is already fast-drying, which seals the volatilization of volatiles in the internal paint layer, and the solvent inside cannot be volatilized normally. Eventually, the topcoat layer will detach and the paint will swell. Slow-drying thinner should be used in the hot season.
1. The paint layer should be thin and even each time the car is sprayed.
2. The leveling time between layers should be sufficient, and the drying temperature should be appropriate and uniform.
3. Use the recommended type of thinner.
First make the paint film fully cured. For minor defects, just sand and polish them. If the defect is more serious, the paint film needs to be polished to the substrate, and then painted again.