Oh, one of the epoxy manufacturers recommends having an aluminum grill pan handy, and if the epoxy starts to overheat, dump it into the pan, let the increased surface area cool things, then back into the mold. If I could walk and chew gum at the same time, I’d think about that…
They say if insulated, it can hit 400F. Mine didn’t get that hot, at least on the surface where I could see what was happening.