It takes about 3 hours for the 4s shop to touch up the paint on the sheet metal. Sheet metal spraying can be divided into paint and powder. Powder spraying dries faster, getting in and out of the drying oven faster, while painting itself is liquid, so it dries more slowly. Sheet metal painting is a kind of automobile repair technology, which is to repair the deformed part of automobile metal shell. For example, if the car body shell is knocked out of a pit, it can be restored to its original state by sheet metal, and then the deformed car metal surface can be restored to the same state as other intact places by spraying special paint. Automotive sheet metal painting process: Determine the scheme: The maintenance master needs to determine the maintenance scheme according to the damage degree of the vehicle before painting, and different solutions will be adopted to different degrees. Sheet metal forming: cutting, grinding, stretching, firing and deoxidation of deformed parts. You should know that sheet metal is not only to restore the original appearance of the vehicle, but also to maintain the hardness of the metal material to the greatest extent. Scraping and shaping: after the sheet metal is corrected, the maintenance master will shape the waistline of the car body and adjust its flatness by scraping and shaping the car body. Spray painting: The process of spray painting is complicated, and it has to go through many processes, such as first primer spraying, intermediate primer spraying, paint mixing, topcoat spraying and paint drying, which must be carried out in a dust-free environment. Paint surface treatment: Although it has been painted, there will still be minor flaws, so the repair union will polish it with extremely fine beauty sandpaper or polishing machine to restore the luster of the car body.