Contact cement should work.
Read the can VERY well (it is extremely flammable).
Clean both items to be glued.
Coat each side (gasket and slide) with the glue and LET DRY!
VERY IMPORTANT STEP.
When comletely dry to the touch; Stick the gasket to the slide.
IT WILL INSTANT BOND. MAKE SURE its where ya want it!
Contact cement is waterproof when dry.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW