Incomplete   drying of primer

Strengthen   curing (increase baking temperature, extend baking time, increase UV curing   energy)

The paint film   is too thick and the internal drying is not complete.

Adjust the   coating method and control the thickness of the paint film.

The primer is   dissolved by the solvent of the topcoat

Choose the   matching primer.

The top coating’s   baking temperature is too high

Control the baking   temperature of the top coating.

Excessive use of thinner leads to   incomplete solvent volatilization.

Reasonably   adjust the amount of thinner added.