Epoxy Question.

Most epoxies are very temperature-sensitive and will cure quickly when warm. However, temperatures above 90 degrees F aren't a good idea because you'll tend to get bubbles in the epoxy. One easy trick to speed up the cure is simply to mix more epoxy than you need and let it set for a few minutes before you use it. The chemical reaction is exothermic, so your glue container will become hot very quickly. Once the epoxy warms up, you'll have to work very quickly.

Most epoxies come in "fast" (or "low temperature") and "slow" formulations. For example, Gougeon Brothers WEST epoxy is available with different hardeners depending on whether you need a fast or slow cure. They say there's no significant difference in the strength whether the fast or slow hardener is used.