Ok, I now have a new-new-new webshooter design. It is much easier to go with a Ben Reilly style shooter, because PVC comes in tubes and it can withstand up to 600 psi, twice that of what Peter pressurizes his cartridges to. The only problem with tubes is that they are harder to conceal and have to be large to contain a suitable amount of fluid. But I want to make an efficiant shooter, not just a shooter. So I will have PVC cartridges pressurized with a bike pump, and a spray paint can trigger will be at the top of each one, releasing the contents under pressure. Then I will carry spares on the shooter itself and on a belt.