The ASTM D333-01 (2021) Standard Guide provides test methods for clear and chromadizing paints to evaluate the performance of these coatings under different operating conditions. The standard covers a variety of test procedures and is applicable to evaluations ranging from simple coatings to complex multi-coating systems. Testing involves a diverse range of substrates, including metals, plastics and wood, and emphasizes the impact of chemical or physical cleaning of the substrates on coating performance. The Guide aims to help users obtain the required mass assurance in multiple Coating systems by scientifically selecting test methods and rationally interpreting the results. This standard conforms to the principles of international standardization and emphasizes safety and environment practices to be observed during use.