Using Peel and Seal on mine $25 for a 12"x 33' roll from the local roofing supplier. Ive used 3m 90 adhesive for a little extra "stick". Used 2 rolls so far and looks like I will need 1 more. Ive done the roof also and Im hoping this will help it from coming down when the weather gets hot.

Hers a link that shows some of it.

http://hotrodders.com/gallery/data/500/8163IMGP0052-med.JPG?1218