This standard applies to the assessment of the painting performance of Spreader paints, including the determination of Appearance and Painting Condition. The standard specifies the materials and equipment used, as well as detailed measurement methods, including viscosity adjustment of Spreader paints, painting operation and evaluation criteria. The test shall be carried out under constant temperature and humidity conditions, and the conformity shall be determined by evaluating the uniformity of the painted surface, the absence of whitening, speckling and bubbles.