Corn starch

[H3L10S]

Ever try adding corn starch to the water? In a small scale test from a syringe with about 1 mm tip diameter, I could shoot through a quarter at 15 feet whereas with just water the stream was about 5 inches across. I'm not sure how much the bare minimum is, as the mixture I used was about 75% corn starch, but it is effective, however costly. Perhaps more can be got from the discovery.

[Drenchenator]

This just shows how effective an increase in viscosity is. Corn starch is a solid, and solids still have viscosity. Viscosity is just the measure of resistance to flow, and solids obviously are resistant to flow. With 3/4 of the substance being corn starch, 3/4 of the viscosity comes from the high viscosity corn starch. And since this substance is basically a solid, range would increase dramatically.

In my opinion, this really is not water gunning because most of substance is not water. It would also not be practical to put this into a water gun because it would really clog up the internals too.

[Silence]

Nice test, but as Drenchenator said, there are way too many problems with its use in a water gun. I suppose you could experiment with other materials that aren't so messy and see what happens, especially if a lower concentration can still be used.