Paint is a kind of organic chemical polymer material that can be coated on the surface of an object with different construction processes to form a solid, strong and continuous film of solid polymer compound. It is usually composed of base material (resin, adhesive), pigment, filler, solvent and a small amount of functional additives.
         Coatings generally have the functions of protection, decoration, marking, antifouling, insulation, etc. and are widely used. Therefore, coating inspection is one of the most effective ways to verify the quality of coatings by using coatings or by companies or individuals. With the development of the national economy and the advancement of science and technology, paint testing is gradually promoting the development of the paint industry to waterborne, high-performance, high-grade, and functional development, and the prospects are more open.