1. There should be no defects such as scratches and scratches on the surface of the parts.

2. The surface of the processed thread is not allowed to have defects such as black skin, bump, buckle and burr. Before painting the surface of all steel parts that need to be painted, rust, scale, grease, dust, dirt, mud, salt and dirt should be removed.

3. Before removing rust, use an organic solvent, lye, emulsifier, steam, etc. to remove grease and dirt on the surface of the steel parts.


4. The time interval between the surface to be coated by shot blasting or manual derusting and the primer coating is not more than 6h.

5. The surface of the riveted parts that are in contact with each other should be coated with antirust paint with a thickness of 30-40 μm before connection. The overlapping edges should be closed with paint, putty or adhesive. Primers damaged due to processing or welding must be repainted.