Generally speaking, there is no paint peeling, only the process of coating the surface with putty. If there is a problem with the use of putty, poor rust removal and rust prevention will lead to cracking and peeling of paint surface. The sheet metal trade union tries to restore the sunken part to its original position without leaving a big pit, so it is not a big problem to seriously remove rust and rust. For the cover part, due to the influence of engine temperature, it is necessary to do a good job of heat insulation.