Re: Boat pinstripe question.
crazy charlie has a good point about the wide pinstriping available in marine. Another thing to keep in mind is if you're going to stripe any curves. I used 1/2" (I think it's 1/2" - I'll have to double check) for my red striping. Anything larger than that would be difficult to curve.
The red stuff is the marine striping. The black letter is cheap 3 year vinyl. I have my own vinyl cutter so I can make my own stickers, numbers, and graphics now.