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Using a da is time consuming but if thats the only then sand with 60-80 grit to remove the paint.Then sand with150-180 grit on the bare metal to remove tha sandscratches from the 60-80 sanderpaper.If no rust repair or dent repair is needed then clean with a wax and grease remover and spray an etch primer and then primer surfacer.Next shoot a guidcoat lightly over the surfacer and block with 240 grit using a longboard sander to make sure the panel is straight. How to tell its straight is when you sand all the black guidecoat and you see all the primer but don't sand to the metal.When only the primer is visible shoot the guidecoat lightly again and wetsand with a long rubber block with 600 grit.Then paint.
To weld the holes if you got a mig welder use 023 size wire. Plug weld those holes. If you don't have a welder then use an acetylene tourch and brazing rod to weld.Grind the welds until the welds are very slightly above the panel then using a countersink hammer pound just that areas down to countersink the metal 1/16.Then clean the metal apply the rage gold bondo and sand with a block 150 grit (since the bondo is fairly little amount) then block sand 240 grit,etchprime,primer surfacer and blocksand and paint.
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