Hot plate. Hot glue is an obvious adhesive, so a burn injury from that would be very painful considering that the substance would be stuck to your skin causing more pain and discomfort. It's like....an incredibly small napalm burn...then again, napalm is powerful too...hmm...
Would you rather:
Fight Blade(Marvel Comics/Wesley Snipes)
or
Fight Alucard(Castlevania: Symphony of the Night)