Hi All. My experience with 5 minute epoxie in the acid process was not too good. I had made a fiberglass braded tube (as used for electrical insulation but not coated with silicone) into a stirrer propeller and attached it to a steel rod. It was incontact with the mix over night during and after the first acid stage. I guess the sulfuric acid attacked the epoxie cuz the whole thing turned to jelly. I had cured the epoxie for several days before use. The 5 minute stuff is not famous for durability in any case. But I would do a test on anything you planned to do in a big way.
Hence my caution - but it's not against epoxy in general, it just seems to vary a lot. We use an extremely tough epoxy putty from Taiwan which is entirely resistant to the biodiesel process, including the acid-base process. But that's not 5-minute stuff, it takes overnight, or better a whole day. So, yes, do tests.
Best wishes Keith
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