Heating epoxy will accelerate the cure time, but the main reason for heating epoxy with a heat gun is to make it flow more easily. My garage/workshop is unheated so if I'm working on a plane in the late winter or early spring, the epoxy stays pretty thick and doesn't spread very well. The heat gun takes care of that problem and I might then take the parts inside the house to since the epoxy takes forever to cure in the cold temps of the garage. Thank goodness for CA or I'd never get anything built.

Jim