Way back, I'd borrowed a little Paasche airbrush to repaint something - maybe my guitar. Anyhow, it was supposed to run off a can of propellant. Realising this wasn't adequate for long, I went up to my old high school, and asked if I could use the woodwork facilities for my project.
No problem, they said, and left me to my own devices...
Anyhow, scouting around saw me find a couple of adapter fittings for the Paasche air pressure line. So far, so good. But I couldn't get it to match the compressor. Looking further, noticed the oxygen tank in the welding rig - same threads!

It's starting to seem promising, I thought. Then, closer inspection of the tank reveals a label saying not to oil the threads. Gets me thinking. Oh - OK, oxygen plus hydrocarbon gives an oxidised hydrocarbon. Hmm. Maybe it's not a good idea to use raw oxygen to propel nitrocellulose.
Honestly, I was that close to using it! That afternoon, borrowed a couple of fittings from a mate and returned the next day to use the compressor. Much happier with that result!