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I keep hearing references to this "Bondo" -- What is that exactly? Some kind of Polyester filler/primer?
I use cheap polyester filler on a lot of my patterns, I've never had any problems with mixing it with Epoxy .. As long as it is allowed to cure for at least 24 hours .
I often make patterns out of cheap floor insulation foam .. it will "melt" when in contact with the EC pattern primer, so I "seal it" with a layer of epoxy, leave it to cure for 24 hours, key it with 120 grit, then use polyester filler and EC pattern Coat primer - If I accidentally sand all the way through to the foam, I just re-seal it with epoxy, then carry on with the Pattern Coat primer ..
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