Some of the numbers on my dacron sail are starting to let go around the edges. What is the best glue for sticking them back down?

Thanks!
Kevin

I'd get some double-sided tape (venture tape). Peel the edge back so that you can get the tape onto the back of the number, then stick the number back onto the sail (obviously trim the tape to the edge of the number if necessary)

www.sailmakersupply.com

Order stickyback in the color of interest, cut new numbers out of the stickyback, and apply to the sail

Windshear adhesive.
http://www.windance.com/default.asp?windance~shownewitem~MM_4001
best thing I've ever seen for sail repair and I now use it for all kinds of stuff including recently re-gluing a piece of rubber trim on my truck!
Murrays carries it too.