The principle of hot melt adhesive drawing is very simple, that is, stick a sucker with the same outline as the notch on the paint surface with hot melt adhesive, and then pull the sucker out with a hammer, so that the notch will be sucked out together, so use hot melt adhesive to repair the small concave-convex sucker of the car. Sheet metal repair, whether it is a large depression or a small depression, can be used to repair. Although sheet metal repair is expensive, it has the best effect.