I believe many people have heard that it is feasible to repair the car body depression with hot water, but this method has great limitations. Once you encounter a dent in an iron-aluminum car, this method will not work. For the repair of deformed metal materials, hot water is obviously not enough. Different repair methods must be selected according to the degree of deformation. For example, in automotive sheet metal plastic molding machine, if the coating surface of the car body has cracks or falls off, this method is also impossible. If it is a plastic depression, it can be repaired with hot water. Most doors are made of iron or aluminum. After the concave, it can be repaired by sheet metal shaping and finally painted. Don't repair the dent in the car body with hot water. In fact, the repair of doorways is to try it yourself. I bought a set of such indentation repair tools online, and the price is not high, just tens of dollars. Clean the concave part first, put the special rubber into the glue gun, turn on the power supply and preheat for about 7 minutes. Secondly, it is necessary to choose suitable gaskets, and use large gaskets for large pits. Note that the larger the washer, the greater the traction. Then use a glue gun to evenly coat the sol on the gasket, quickly stick it to the pit, and gently hold down the special glue until it is solidified and released. Align the center hole of the traction bridge with the fixed gasket, tighten the nut on the gasket screw, and continue to turn the nut until the depression becomes flat. After the repair, remove the tool, spray alcohol on the body glue, and finally clean it with a blade. If you don't trust your ability, hand it over to the repair shop outside. They generally call the repair of the car body depression "light sheet metal", which is actually very similar to the principle we do ourselves. Use a tool to suck out the position of the pit, put it behind the pit with a hook, and then slowly squeeze it out. Finally, the protruding part is treated with a rubber hammer.