What is Hi-Float made out of, and is it possible to make my own?
is, apparently, some liquid you can pump into a balloon to make it stay
inflated for a longer amount of time. I can't seem to find anything
other than commercial promotion on a Google search, and I'm terribly
curious about how it does this, what it's made out of, and whether it
would be feasible to make it myself, homebrew-style.