Ratios are the most important issue.
Dave if you mix in a little too much of the quickener or catalyst (they never say which is which) it will set up fast, I do mean fast. The opposite is also true if you don't get enough catalyst in the mix it can take much longer or not work at all. A 15 min epoxy should not set up in 5 minutes under 85 degrees. I use nothing, nothing, but 30 minute epoxy or JB Weld if brass is involved. Accra-glass at least has very clear instructions. It all still takes overnight to harden completely anyway, why bother?
If you need a quick glue joint then go with the CA glues and leave the 5-10-15 minute stuff behind you.
Drover HEAT will loosen epoxy glues so if you are getting your tang too hot the glue will let go. Keep the temps down.
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