Trying to adhere McMaster Carr rubber door seals to my fiberglas doors. Looking for your suggestions. I found a clear 3m marine adhesive sealant after 10 stops today at a variety of auto/hardware/marine stores. The 3m tube said it adheres to fiberglas and rubber. Finally just what I wanted. When I cut the first tip with my utility knife, the entire tip broke off from the tube. The second tube would not expel the adhesive. When I returned both to the store, we noticed the DOM was 09/06. Spent the entire day with no forward movement.