Ed and all,
I've never noticed (probably not paying enough attention, or the amounts
were too small) heat given off by curing epoxy, but be cautious of
potential side effects. From West System's epoxy chemistry page:
"Several inches of mixed epoxy in a confined mass (such as a mixing cup)
will generate enough heat to melt a plastic cup, burn your skin or
ignite combustible materials if left to stand for its full pot life."
Adding zilch to the problem of repairing a handle,