The Stovebolt Site Forums The Shop Area Paint and Body Shop Repairing small, thin-edged holes

I agree with 4ontheFloor. It's a lot easier to just cut the damage out to good metal and weld in a patch if you have good access.

Welding the edge of sheet metal is tricky and since you have a gas welding setup you could try brazing a patch over the back of the hole and then finishing in with bondo. If it's a real delicate area you could use silver solder or even tin the patch and back of the damaged area and sweat the patch on with plain old solder if heat is a critical concern.