I got a airbrush for my birthday. I've never even held one before so I probably should have read the instructions. I don't have a compressor so I got a can of Propel, which appears to be full of butane. Anyway, I hooked the hose up to the can first, instead of to the airbrush first. As soon as I had made about two twists of the hose it came to life. butane was filling the room and the hose was like an angry, hissing, snake. The loose end flipped up and smacked me right on the bridge of my nose, and froze me. That stuff is cold.