Pin striping is incredible, but takes more patience than you could ever imagine. One shot works very well. I'm new to doing it on bikes, but i've dabbled with it on cars too and know many people that do it.

One shot is great stuff. Very durable, and more forgiving than other automotive paints and much easier to use. Enamels work the best. Conventional automotive paints are too thin.

As for brushes. Mack are some of the best around. They make a wide array of them. 0 or 00 are some of the common sizes. But for technical areas like bikes, lettering or sign making brushes work better.

Dick Blick has a huge assortment of brushes and paint colors. They sell everything online and in stores. Or they have them at eastwood company as well. Its a blast to mess around with. But it takes a while to get the hang of. I suggest practicing on a piece of glass to get the hang of the strokes before doing it on a bike. But if you try on your bike first, you can wipe it off with paint thinner or mineral spirits.

There are also tools available like this:
http://www.eastwood.com/pinstriping/...iping-kit.html

Some are less expensize than the beugler, but they give you perfect lines everytime.