The humidity of construction 

environment is too high or the 

solvent volatilizes too fast, causing 

the moisture to condense.

Control the temperature and humidity of the painting 

environment.

The paint film is not cured 

completely.

Strengthen curing such as 

increasing the baking tem-

perature, extending the bak-

ing time and increasing the 

UV curing energy.

The coating layer is too thin, show-

ing the base color of the substrate.

Extend the coating time to 

ensure the thickness of the 

coating layer.