UM, Ok, I'm biulding a guitar at the mo, and looking around for paints etc etc, now, I dont think you can use normal house paints for example .... I dont think you need to use certain paints, I mean you could get away with it suppouse, but Cellulose laquers are pretty popular which are used on guitar.

About spraying, just go get an airbrush art book, it'll tell you about the basics, which are universal...