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1. The substrate must be cleaned to ensure no oil, no dust and no rust. Can be pickled, phosphatized or white oil, solvent cleaning and other programs. 2, in order to prevent rust, a layer of anti-rust primer should be sprayed before the paint. Note that the strong solvent topcoat does not use a weak solvent primer, and the topcoat is sprayed after the primer is dry, otherwise it may bite the bottom. Where necessary, it is necessary to apply adhesion and better dry putty. 3, the construction viscosity is generally 16-22 seconds (coat 4 cups). The viscosity is too low, easy to sag, not easy to cover; high, surface flow adjustment, wrinkles, and even foaming, pitting. 4, the air pressure should be maintained at 0.5pa-0.8pa, to ensure good fog fogging, qiang distance is 25-30cm. 5. When spraying, it should be sprayed many times. Press first, then lower, first and second, then the main visual surface, first and then the outer spray. If the spray thickness of the last pass is too thin, there is less room for the film-forming material, and the paint film is rough and loses light. 6, baking paint according to the required temperature, time baking, heating too fast or too high temperature can cause loss of light. Please note that the oven temperature is uniform and the meter reading is accurate. These factors are the main reason for complaints about the quality of the paint.