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WANNA930 WANNA930 is offline
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Join Date: May 2008
Posts: 422
Used to do this in the street rod world and would always advise against it. Like noted there are three sheets of metal coming together and usually seam sealer and lead filling the joint. You are essentially braking the bond between the 3 panels.

It is a difficult job to do correctly and remove all the sealer and lead. You see people all the time trying to mig weld and not understand why it is popping and spitting back at them as they do not realize it isn't bare metal but has a layer of lead.

The issue with it coming back through has noting to do with the bondo but rather how it was welded and grinded down. Mig welds are hard and brittle and guys lay on a bead without proper penetration due to fear of warping, they then grind this weld down and it cracks because the weld and surrounding metal are too thin and fail.

Bondo or plastic fillers are blamed for many things when it is the actual metal work and welds that cause the movement which make the bondo crack.

There is no getting around the warping and inability to remove it due to where the gutters are. There is no access, so you might as well tig or gas weld so you know it won't crack. I would always lead the joints for extra security.

You can get an experienced metal man to remove the sealer and grind then down to a lower profile, fold them over (with a wire inserted) o give a nice low profile gutter that would look almost factory.

Not worth it in my book.
Old 02-08-2013, 10:00 PM
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