"I didn't read the whole thing, but I got your point.

Aside from safety issues, I think super soaker flamethrowers are a bad idea because they don't work like a proper flamethrower is supposed to.

A proper flamethrower's fuel is very viscous. Basically a runny gel. The purpose of this is when you shoot something with it, the fuel sticks to the target and continues to burn, which also allows the fire to spread on its target.

Super soakers can't handle a fluid more viscous than water, therefor you have to use pure alcohol/gasolines/etc to achieve a flame. These fuels burn quickly, so if you shoot a target with it, it will burn up before it does any sort of damage. Try this scenario. You spray someone in the face with a flamethrower that shoots just gas. When you take your finger off the trigger, all you really did was give him a little sunburn and singe their eyebrows off.

Paint guns and garden sprayers will handle a viscous fluid, so if you are dead set on making a flamethrower, use one of them. And don't make your napalm with packing peanuts and foam, it burns horribly and is hard to light. Diesel mixed with silica gel works best."