If the back side of the dent is accessible, you can push it out by hitting it gently from the back side using a hammer with a wooden or plastic head. When doing this, hold a wooden block on the opposite side to avoid bulging of the metal.
Rubber-headed hammer
If the dent is in a place where the back side is inaccessible, another technique should be used. Drill several small holes in the metal around the dented area. Then screw long self-tapping screws into the hole. After that, the dent can be pulled out by grasping the screw heads with pliers.
The next stage of repair will be removing paint from the damaged area and another 2.5 cm from its border from the undamaged part of the body. This is easiest to do using a metal brush or a special attachment on a drill, but you can also do it with regular sandpaper. To complete the preparation for putty, scratch the surface of the bare metal with a screwdriver or the end of a file, or drill small holes in the damaged area. This will ensure better adhesion of the putty paste. Then repair is carried out as described in previous section.
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