That's very cool! I used to do a lot of fabrication work, graduated highschool with a welding cert. We would take our finished fab jobs and hang them in the painting booth on a couple different jobs. We mixed our own paints and put them in a paint gun to coat it. One job had a professional come in and give us a class on how to mix automotive paint and apply an even coat. Very fun stuff! In my highschool-tradeschool-college situation there were people in automotive class that got special classes on how to apply detailed art to the cars and damn they got good at the end there. Someone once said that airbrush painting was cheating, but I say if you ain't cheating you aint trying. Besides, they're just jealous. No one can make air brush look good unless they're a skilled artist. Huzzah! Side money with art is great! Do your buddy's bike proud!