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03-05-2010 #1
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More likely than anything, you have a pinhole in your weld.
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03-05-2010 #2
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That is possible, but how would you approach fixing it? I plan on grinding out that section to remove the rust, but I need input on how to best prevent it from coming back since I can not get to the underside and coat it. Otherwise I fear just filling back in and painting it will just fix the current issue and not prevent it from happening again.
Originally Posted by monteboy84
03-05-2010 #3
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I don't think it's rust, the body filler is swelling due to moisture wicking through porous welds (pin holes). Did you use butt welds? If you did you need to fill in any voids and then coat with epoxy before you apply filler. Body filler absorbs moisture and then it swells. It needs to be fully sealed from moisture on both sides. Applying body filler to bare metal is bad practice in my opinion.
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