3M 77 spray-on glue quite strong, but not really strong enough for keeping saddle skins on, especially if the saddle is ever exposed to heat/sun. Best to use in this case is contact cement, which you apply to the cover and what you are adhering it to and let it dry to full tackiness before you glue them together. You have to get it lined up correctly though, as once it's stuck together, it will be really stuck together.......instantly, and pretty much permaneently (as you have to pretty much destroy the cover to get it off the saddle)!