The ASTM D5066-1991 (2017) standard provides a standard test method for determining transfer efficiency in automotive coatings lame plating applications, using a weighted method. In the lame plating process, transfer efficiency refers to the ratio between the amount of Coating actually attached to the target surface and the total amount of Coating consumed during the lame plating process. The test method of this standard accurately determines the transfer efficiency of Coatings by weighing to evaluate and optimize the efficiency of Coating use, reduce waste, and improve production efficiency. By implementing this standard, manufacturers can better control the amount of coatings used, reduce costs and reduce environmental impact, while improving the environmental friendliness and economy of the lame plating process. The implementation of the standard provides a scientific basis for the automotive coatings industry and promotes the development of Coating application technology.