Insufficient leveling time after   painting. Heating up too fast during baking

Extend flash time.

If the coating is too thick, the 

solvent will not evaporate.

Reduce the oil   output of the spray gun, speed up the spraying speed, and reduce the number   of spraying.

The coated   plastic parts are not cooled, and the flash-off time is too short, causing   the solvent in the wet film to evaporate rapidly.

Reduce the   temperature of the surface of the coated object.

The paint is   stirred for a long time, forming countless tiny air bubbles.

After the paint   is stirred, it should be allowed to stand for a while, and spray after the   bubbles disappear.

The improper   selection of thinner will cause the surface of the paint film to dry too   quickly, and the bottom layer solvent will not be volatile.

Choose a right thinner.

The surface of the object being 

coated is rough or oily.

Carefully polish,like   choosing the correct sandpaper type and polishing method, to eliminate the   influence of oil on the surface of the coated object.

Compressed air, paint or thinner 

contains moisture or oil.

Ensure the   cleanliness of the compressed air and avoid contamination of the paint or   thinner by moisture or oil.

The primer is   not fully dried, and the top coat is sprayed.

The top coat is   applied after the primer is fully cured.