The rapid dent repair without painting is based on a series of principles, and the dents with different depths are extracted step by step from the interior of the car body to restore the original appearance. The following information is relevant: 1. Technical advantages of paint-free and traceless repair of automobile dents: (1) Quick repair of paint-free automobile dents saves the processes of sheet metal, putty scraping and painting, and only needs to use tensile force to repair damaged dents, so the repair speed is very fast. (2) Low cost. Because the repair time is short and the process is simple, the cost is low and the price is very affordable. (3) Perfect repair As long as there is no paint-free paint-free body depression repair, it can be perfectly repaired without leaving traces. At the same time, the original car paint is retained to achieve disguised value preservation. 2. Method of testing whether the repair is perfect: under the illumination of the lamp, observe whether the paint lines are evenly arranged from the concave side.