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Old 05-10-2012, 12:14 AM   #4 (permalink)
Ryland
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If you do end up using bondo or other filler, never put it over rust or on to bare steel! it has to be over primed or pained steel, bondo can hold water and is like putting a wet sponge on the bare steel, same with any kind of fiberglass resin.
Grind away the rust, clean it, prime it then fill it, or just paint it so you can tell right away if it's rusting again.
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