I used to think that the glue gun was an "old lady" craft tool that had no place in MRRing. Boy, was I wrong. That stuff is the bomb. Other than accelerated super glues or contact cements, it's about as close to instant glue as you will find. It still takes a minute or two to cool down and harden, but once it's hardened, it's hard to beat, literally. I use it to glue foam, wood, cardboard, cardstock, track and about anything else that doesn't require precision glueing.
Be careful when glue track with this stuff. Don't use alot. Alittle dab will do and it will cool down much faster than "The Blob". Make sure your track can't move by applying weights or temp nails. What you don't want is for the glue to get under a tie and harden, which can create bumps. You can tack glue the tips of the ties and it will hold fine even on foam. You don't have to glue every tie, just enough to hold everything down.
It takes some getting used to. Learning "not to touch it, until it is cool" is probably your first lesson. When that happens, rub your finger on something quick, it'll help cool it down and roll it off your quickly burning finger tips.
The next lesson is the art of "no cob webs". All I can say is "don't pull the gun away to quick. The urge to do so is strong, but you must resist the temptation.
Oh yeah, don't worry about special temp glues, the cheap ones at the craft shops work fine for all of my hot gluing needs.
I highly recommend getting one. Go to a craft shop Micheal's or Hobby Lobby and buy one. Get one that handles the large 3/8" sticks.