First, the strong material I was describing needs to be linked into a formula. It is too inflexible otherewise. Second, the foam isn't strong, it just expands. The reason Peter would need a machine is because the strong substance is expensive when bought, but INCREDIBLY cheap when made. It would take literally five dollars to make a few ounces. It is very time consuming though. he would need to set up a machine to do it fast enough.
As for the high expansion fluid, I'm pretty sure it could be made for cheaper. I need to find a patent to look at the chemistry. The turbine isn't the only way to do this. Does everyone know how foam works?
A substance known as a surfactant is half polar. It will link one end to a polar substance like water, and the other end to something nonpolar, like oil. When any pressure whatsoever comes into the mix, it messes up the order and causes the gaps the surfactant creates to be filled with the agitational substance. In our case, the surfactant is longer and can be filled with ALOT of the pressure. I need to look at the formula, but it just takes pressure to cause expansion. A Co2 cartridge will provide the neccessary pressure as long as the nozzle is focused. The turbine will just help with the agitation.