I don't know, but I sure wouldn't suggest masking for a pinstripe. It' not a negative comment, no more than someone asking how to clean an icepick after digging a trench. Wouldn't you steer them towards a shovel, or equipment? Masking is far too difficult to get a straight line, much less a line that is even in thickness without jagged edges IMO. I'm a do-it-myself kind of guy, but I would suggest that Bruce get one of those stripers that has the little adjustable arm that you can use as a guide....I think it is a roller of some sort. Maybe that is what was mentioned above, I don't know what they are called. That should give a nice, even line, and if you follow a bodyline carefully, it should be straight.
If I had started this post, I'd want all the input possible before I started and I'd want to know what has worked and has NOT worked for people. Don't worry, Bruce will make up his own mind and do what he wants. As for me, I'll keep the negative comments coming if I think it might help somebody.