Glad to see the peanut gallery has chimed in (see above 2 posts).

The problem with double sides tape is the wind will catch the edges and flap around, if not tear the number partially off, maybe all the way off since I don't know how well it will stick to lycra.

Spray mount is annoying stuff. It takes a week to rub off fingers, or at least paint thinner. I sure hope they're not talking about that.