Almost 24 hours later, the 1:1 epoxy resin finally seems to have hardened to a non-sticky finish. It's actually great weather now (not hot, not humid) but it might help to set up the heat lamp in the area I work in.

The small sample that was diluted with acetone (aka nail polish remover) at something like 50% is still gooey 10 hours later. This is the same sort of thing I've seen in the past with local 30-min and 90-min epoxies as well as some Z-poxy which I've sort of given up on.