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if it was in my shop i would spot blast it . you can buy little spot sand blasters for cheap . its always best to remove the rust by blasting it rather than trying to sand or grind it off . by sanding and grinding you will also be removing metal making the panel thinner . if you leave even one little pit of rust it will come back making all your hard work point less . after its sand blasted spray a coat of chromated etch primer on it then do your body work over the top of that . its more than ok to do fill work over a etch prime just sand the etch primer with a 180 grit paper .
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