heating the epoxy will make it flow better - it will also make it cure faster, so don't overdo it.

I was experimenting with heating it in the micro a few years ago, no kidding( I'm not married ). 5 seconds on high is plenty for one batch. It will be watery and set in a couple minutes. 3 seconds would probably be a better temp.

I tried 10 seconds once, hee, hee. It went exothermic in my hand while I was walking from the micro to the bench and had to pitch the stuff into a wash basin to keep boiling epoxy from foaming over onto my hand. Man, that was stupid