If you love building models and want your glue to hold instantly, check out this stuff. It works with cyanoacrylate-based “super” glue and accelerates its bonding so you can move on quickly without clamping, and won’t craze plastics or foams. Glue combo pack here.
Hot glue gun are cheap and easy to find. Still, it’s cool to know that you can make your own in a pinch using a soda can, a lighter, and some electrical tape. MrGear’s DIY version works surprisingly well, and is a great hack if you’ve got wrong-sized glue sticks lying around.