OK, I'm new here, so I'll tread a little light...Wasp spray is usually a simple hydrocarbon that passes through the wasp's carapace and "interrupts" their open circulatory system. Nerve gas is an organophospate or carbamate, more common in the "tree spray" variant of insecticide.
Dry chem extinguishers hurt like heck when you get the powder on exposed mucous membranes or eyes, but Capsum Mace in PD strength hurts more....
You can buy the "super mace" canisters made for Bears, which is actually a small Halon extinguisher filled with mace...thus, the best of both worlds...
Oh, and the standard fire hose line (1-1/2, 1-3/4, 2" diameter) are not painful when employed at the standard 100 psi for a fog nozzle or 70 psi straight bore... we play with them all the time...
2.5" hoses and over can be painful, but not really....
