QJ 990.2-1986 "Coating inspection method coating Appearance inspection method" is suitable for the inspection of the surface coating Appearance of our basic products and ancillary products. The standard uses visual inspection method and hand stroking method to evaluate the Smoothness and mechanical impurities of coatings. During the inspection process, visual inspection is required under specific lighting conditions to ensure that the Appearance of coatings under natural scattered light or white transmitted light meets the standard requirements. At the same time, the hand stroking method can be used to assist in the inspection of coating flatness and surface mechanical impurities to ensure that the coating mass meets the provisions of QJ813-83 "General Technical Conditions for Painting".