Putty-free sheet metal repair is a method of sheet metal repair. Its main principle is different from the traditional putty scraping. It directly uses painting technology and special tools to restore the deformed metal shell to its original shape, thus achieving good repair effect without damaging the car paint. The putty-free sheet metal repair can directly use professional painting tools and professional painting technology, which can restore the deformed metal part of the vehicle shell to its original appearance. Sheet metal is a comprehensive cold working process of sheet metal, including sheet metal drawing, paint polishing, molding by molding machine, welding leveling, data measurement, indicator application, covering sheet metal liquid and primer, baking paint and thickness measurement.