Step 7Spray
My pressurization lasted enough to make the dinosaur shown here and then some, a second pressurization was required to make the buildings. If you're looking to make a larger art installment you'll need to carry your bike pump with you.
Here's a video of my DIY spray paint in action!
Have fun!
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I have a large airless sprayer and on most paint cans there are instructions as to how to mix it for spraying. something like 1/2 a cup to a gallon for primer i think.
And 80 psi is usually attributed to a insertion of the bike tire pump anyways - although cutting the hole in the cap will be your weak point. If you use an epoxy for the cap and then a liquid metal on the outside of that I'm sure it will hold fine at 50-80.
Would be interesting if someone came up with a mechanism to add paint to the bottle so you don't have to make omg yuou just unscrew the CAP! AMAZING.