There are MANY different types of propellents ...some more safe than others . The traditional propellent is hair spray , Aqua Net is the BEST to use because it's cheap and has LOTS of alcohol in it . BUT there are other things that people use I've heard of using Starting fluid ( about $2 a can ) THIS IS VERY STRONG STUFF !! I've never used it before but i've herd it's a REAL BLAST! WD40 is suppose to work pretty good also , butane gas from a shop torch ( just scares the crap out of me ) is STRONG but i wouldn't suggest it because it MIGHT blow up and the fragments of PVC would REALLY HURT if they hit you .
