I sometimes use this space heater I have that has a fan in it, It dries the resin quickly, but be careful when you heat things up or your armor will go up in flames, you don't want to much heat
Honestly, most will say not to use anything with an exposed element that can ignite the fumes. But, I have used a heat gun and it does kick it off real fast. However, it can ignite the fumes. So do it at your own risk. If you choose to try it, I suggest using a box fan to blow the fumes away from the gun/hair dryer. You can pick one up at home depot or wal mart for cheap ($20).
If you added the right amount of hardener, resin should be dry to the touch in about 20 minutes at room temperature. If it's still sticky after several hours, then try dusting it with talcum or baby powder.