stripes

there's always a lot of discussion of what the best bottom paint is, but i'm wondering what paint to use *above* the waterline, for a stripe or such. the blue stripes that run the length of my 27 where hull meets deck are badly faded by the years, and i'm thinking a fresh coat of something could...

On the grounds that there is no such thing as a stupid question, what are draft stripes and should I have them put on my new mainsail? Cheers, Roger Kingston, ON