I would use the epoxy. Scuff for body work, when your finished scuff the areas you didn't touch then epoxy again. I like to do my seam sealer at this point and if your quick about it you can spray your high build urethane within the adhesion window. I wait to do my seam sealer in the drip rails until a few days before paint so the high build doesn't build up and crack.
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1969 GTO street strip project 11.1 forged 461, highport heads
1995 Trans-am 420 ci sb 14:1 compression 9"ford
9.89@132 1.34 60ft SOLD!
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