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How deep are the pits? Is it going to be a show vehicle? If the pits aren't to bad, go over the frame with 80 grit on the DA and use a product like an Epoxy primer that has build and sanding qualities...like SPI....(I haven't tried it yet but will shortly and with all the firm believers on this forum I thought I'd suggest it before somebody else...LOL). Seriously, with a high build Epoxy that you can sand and with reducing your pitted metal profile with 80 grit, you should be able to get rid of most of the imperfections...if you still have some imperfections, a little 2 part finishing putty and a re-prime in those areas would fix it up...if it doesn't...look at getting a new or different frame as the one you have may then be to week to work with.
Ray
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