p.s. If you do shop for an airbrush, make sure you look for one that will handle oil-based paints, since you're using One Shot. Not all brushes will and the solvents used to thin the paint and clean the brush will eat the seals on some of them. With a detail gun, you won't have that problem since they're designed to use oil and urethane based paints.

Also, conventional spray guns, even detail guns, put out so much pressure that most of your paint blows right past something as thin as a bike frame tube. Hence, the LVLP gun, with puts out a lot of paint, but with much lower pressures. FWIW.