GB/T 6753.2-1986 "Coating surface drying test, small glass ball method" standard stipulates the method of testing the drying condition of the coating surface by the small glass ball method. The test is carried out by spreading small glass balls on the coating surface and evaluating the drying degree of the coating surface according to the interaction between the sphere and the coating surface. The standard specifies the steps of the test operation, the test conditions and the determination criteria for the degree of drying. This method is widely used in the production of coatings and quality control. By accurately testing the drying performance of coatings, the effect of coatings in practical applications is ensured, especially in the rapid construction and large-area painting process. It has important guiding significance.