I have a little blue CH storage tank for airing tires, etc.
I attached a quick-collar to it and a regulator/moisture trap.
I can air the tank to about 120 PSI from the big compressor in my garage and I can get about one paint cup and a clean-up out of it before I have to re-fill. Works great because on larger jobs, I just take the quick release on the regulator/MT down to my compressor and paint in my garage. Good set-up and free re-fills!!
VMAX