Thanks for the response. Nothing would surprise me about how they put these things together. Well I can tell you that whatever it is was very pliable and stretchy when I peeled the side back and the front section,but now it is hard. I had one person tell me to use a urethane adhesive. Spent most of today wire brushing rotten wood and getting alot of the wood particles off of the TPO. I ordered a bunch of 3m 4000uv caulking today,man that stuff is not cheap. It was $22 per tube at west marine,I managed to find online for 12.99 and no sales tax.