GB/T 13452.2-2008 "Determination of Paints and varnish Film Thickness" standard specifies the measurement method of coating wet film thickness, dry-film thickness, uncured powder Coating thickness and paint film thickness on rough surfaces. This standard refers to ISO and GB/T and other related standards to describe in detail the application scope, current standards and accuracy requirements of various Measuring methods. The terminology part defines key terms such as coating and paint film thickness, providing a basis for a unified understanding of the standard. Methods include mechanical methods (e.g. Wet Film Comb, Thickness Wheel and dial), weight analysis and photothermal methods, each of which provides suitability assessment and operation guidelines for different Coatings and substrate combinations. This standard is applicable to the Coatings industry and quality control to ensure the accuracy and Reliability of Coating thickness measurements.