Ya know I used to think that the pinstriper was doing it free hand and that made me feel special. Then I saw a picture of how he does it. Its all papered off, he dips his brush in the paint and follows the line. Is it still cool? Yes. Did it loose a bit of the impression that a really good artist was free handing so many bikes a day? Certainly.
But as to your answer,, I dont have a clue.
