Aerosol

Aerosol propelents come in cans, you can buy them at wal*mart, and they do not need any auxillary hardware (like a fuel meter) to use. As such, they are quite popular.

It is recomended that you avoid using hairspray, as it will gum up your chamber. Deoderant is much better - the generaly recomend one is "right guard" in the brown can, although any spray with flamable propelents will work (check for things like propane, butane, florohydrocardons...). Many dislike the smell of "burnt flowers".

Because of the inconsistent amount of fuel delivered, it does not yeild the preformance that metered propane does - the pressure generated during a closed chamber firing is often estimated at about 30-40 psi, as compared to 40-50. If your cannon is not firing, or is firing weakly and you have a flamable fuel (verified by spraying over a flame): check the Ignition source. If you are getting a spark, you are most likely spraying too much fuel in; play around with how much you spray in until you get a good bang. (and remember to vent your chamber between shots)