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if it is just surface rust, what i would do is take my 3m black roloc remove the rust, d.a. with 80, 120. 180 then apply a ETCH PRIME!!! if my roloc left any marks then i apply a light coat of FINISHING GLAZE!!!!
then apply another coat of ETCH PRIME!!! THE THE CORRSION RESISTANT PRIMER!!! AT LEAST PPG`S PRIMER IS CORROSION RESISTANT
if it is a hole, i wont even get into depth on how to be a fabricator, and or a bodyman which is needed to know what your cutting, where your going to cut, then shape the metal, and all the other procedures invovled in making a patch and making it last
in closing take it to a shop and let US THE PROFESSIONALS HANDLE IT
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