pretty much what's been said, I won't repeat it all, but did make me remember being younger and dumber. Back in my freshman year of school I remember being in art class and me , being me and not thinking about this decided to lay a nice dollop of hot clue out and stick my thumb in it. yeah that was a good idea for about oh, 3 seconds. You can't get that off fast enough and boy did it blister. Never dawned on me at the time that it was a high end (read HOT) high temp setup, I used to always mess around with the low temp mini cheapo guns ( hot glued my entire hand once, and again, seemed like a good idea at the time) so I really didn't think about it before I did it. sadly this was well before youtube (though not before the internet, but a 14.4k modem was fast back then) and I see it as a lost opertunity.
I gotta get a pic of the arkane glue gun my wife used to use, high tem full size an no trigger, never had one, you had to push the sticks through with you thumb, and heaven help you if you got a high flow when loading another stick, high speed glue across your nuckles is not a good time.