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Holes need to be welded up, the welds ground down then the body filler spread and sanded.


I agree thats the "proper" way to repair holes, but you can also fill the hole with fibreglass filler as a quick fix.

To pull big dents out you'll need a slide hammer. You just drill a small hole into the middle of the dent, screw the end of the slide hammer into the hole and pull away. Or if you can get behind the dent you always try and push/bash the dent out from behind. Then bondo over whats left.