Clean the surface of qualified units, clean the oil stains and dirt on the surface of diesel generators, wipe off the dirt and dust on the surface of the electrode, and drain diesel, oil, and water. If each part of the paint is intact and the color is new, there is no need to re-paint. If the paint is damaged or the color changes like the old one, it must be repainted according to the color of the original machine or according to the user’s requirements. Spray paint requires uniform paint film, no leakage, wrinkles, lacquer tumors, flow marks, and other defects.