Comments about Devcon Devcon Rubber Adhesive:
I tried to glue two pieces of 20 mil vinyl sheeting together and this stuff did not work well at all. I was careful to follow the instructions but even after letting it cure overnight I was able to easily peel the two pieces apart and roll the glue off with my fingers. I assumed I had used too much and tried again, but it did not work. Perhaps it will work for other things, but it failed miserably at bonding vinyl.