The coating is generally composed of film forming materials, fillers (pigments and fillers), solvents and additives. Sometimes the composition will change slightly according to the performance requirements, for example, there is no pigment or filler in the varnish, and there may be no solvent in the powder coating.

The color, luster, pattern and flatness of the paint. When objects of different materials are painted, they can get colorful appearance, play a role in beautifying the human living environment, and make an important contribution to human material life and spiritual life.