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Originally Posted by phidauex
But if you seal the rust and use a quality epoxy filler, it'll last as long as the rest of the panel.
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I did that kind of repair to my 250SE. I problem I have is that the metal and epoxy expand at different rates with temperature. The result has been a noticeable junction between the repair and metal has arisen that seems to get worse each year. If I was going to spend any money on a good paint job I would never put it over a bondo only repair. Those fillers work fine to fill in small imperfections but they need to be backed up with metal or you will be in trouble.