We have them at work for painting odd ball small things. I tried it on a fixture I made. It doesn't atomize nearly as well as a real spray gun. I would say the quality was similar to a regular spray bomb.
Here's how you do it. Connect a working 5 gallon air compressor to a spray paint can.. Get your favourite color paint, add into can. Favorite spray tip. Add to can. Seal can. Load up the air.. make sure you have a control valve. Enjoy! < I really did this cheap spray gun, it actually comes out pretty darn good. LOL pointless. but I'm to cheap to buy a REAL HPLV gun, or what ever their called.
mostly to cheap to buy the air compressor to GO with it.