I have done some research on the art of pin striping, or coach lining as it was formerly known. There is quite a sub-culture on this in the US, where intricate patterns is still the thing to have on your hot rod or Harley. This means that lots of the right brushes and paints are readily available, as a quick search on the web will show. Also ebay is a good place to purchase this. You have to get yourself one or more of the special long haried brushes made by companies like Mack and a tin of 1 Shot paint, and start practising. Lots of videos can be found on YouTube, showing skilled chaps at their art. I want to do this once I get my tank re-chromed and painted. It was done with masking tape on my current tank, and it just doesn't look right.
Otto in Denmark