As promised - Took my pump up sprayer (56oz Flo Master, $6.62) I use at work for degreasing and added a stubby valve stem.
Their website lists 20-30 pumps to pressurize. I filled the fluid to the top line to have the least amount of air to compress. Did 30 pumps and checked the pressure - 40psi.
Since it`s just filled with water, I took my tire filler connected to our 130psi shop air and gave it a few very brief blips - 40psi. Do this at your own discretion, my filler can do a pretty light creep for air flow; and keep in mind for the price they make these things for I`m sure bomb proof quality wasn`t first on their design priority list.
I have a different model sprayer at home I`ll bring in, do the same thing, and report back. That sprayer is a better match for the videos online where people mod them to be foaming sprayers.
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