The surface of the coated object is wet or there are substances such as acid, alkali, salt and oil.

Ensure the cleanliness of the 

surface of the coated object.

The surface of the coated object is 

too rough, resulting in a large 

amount of paint absorption.

Carefully polish, choose the 

appropriate sandpaper model and polishing method to 

eliminate the roughness of 

the coated surface.

The primer and the topcoat are not matched.The primer absorbs the 

topcoat.

Increase the compatibility of primer and topcoat to 

eliminate the absorption of 

topcoat from primer.

The paint film is too thin.

Increase the oil output of the spray gun, slow down the speed of the gun, increase the 

number of guns, and ensure 

the thickness of the coating.

The moisture or oil in the 

compressed air is not cleanly 

removed and mixed into the 

coating to cause loss of gloss.

Ensure the quality of 

compressed air.

Paint mixing tools and equipment, painting tools are not clean so that the paint is mixed with water or oil.

Ensure the cleanliness of 

coating equipment and tools.

The humidity of the construction 

environment is high, greater than 

90%, and the coating is easy to lose gloss due to water absorption. The application temperature is too high, the drying is too slow, and the 

water accumulates on the surface tocause loss of gloss.

Control the temperature and humidity of the painting 

environment. It is 

recommended to bake and 

dry during spraying in a low 

temperature environment

The air in the drying room is dirty or the baking temperature is too high, resulting in loss of gloss.

Ensure that the air in the dry-

ing room is clean and control the baking temperature.

Paint or thinner mixed with water or oil.

Ensure that the coating 

equipment and tools are 

clean.