The ASTM D5066-1991 (2011) standard provides a standard test method for determining the transfer efficiency of coatings under the production conditions of lame plating automotive coatings. This method measures the transfer efficiency of coatings during lame plating by weighing, that is, the ratio between the weight of the Coating actually attached to the target surface and the total amount of Coating used in the lame plating process. This standard is designed to help Coating manufacturers optimize the lame plating process, improve Coating utilization, reduce waste, and reduce production costs. The standard details the experimental equipment, operation procedures, and data calculation methods to ensure the accuracy and Repeatability of the experiment. The implementation of this standard helps to improve the environmental friendliness and economy of lame plating operations and promote technological advancements in the automotive coatings industry.