Review on 3M Scotch Weld 20878 Urethane Adhesive by Jose Strong

I bought this adhesive to seal a hole in my swim bag. Since the bag is made of thickly coated nylon fabric, flexibility was paramount. 10 minutes of work is no problem. I glued the patch in place, placed a layer of wax paper on top, and then placed a 5 pound block of steel in the patch area. Waited 24 hours and that's it. Flexible and waterproof, perfect. I've used contact cement in the past and it never lasts long.