Go paint gun if you can. Being someone who has tried both rattle cans AND the recent switch to a paint gun, I think I can honestly say I'll never go back to paint bombs. MUCH better finish, so far. I, too, bought one of those Harbor Freight Tools guns, but I bought the jam gun, and, so far, it's a pretty decent little gun. Looks just like the Stewmac one, but not certain it IS. Didn't take much time on a piece of scrap to get it dialed in and get me acclimated to it. I MAY try and get one of their gravity feeds, in the future, though, and try that. Since I'm in the clearcoat stage of my project, I may try switching to one of my larger guns that I've had sitting around, for years, and see how THAT fairs on laying down coats.