If you want to try the adhesive method, you have to remember that it is very hard to adhere to those poly materials. They really can't be glued, you need to make a mechnical bond. So rough up the surface, the poly canoe material is actually flame treated to get some tooth.
I once used RTV to hold a big piece of poly board, left over from my house, to the smooth fiberglass in the bilge. I then screwed mounts for a spare anchor into the board, it held for years.
You need to make a good size piece, make it rough and I would use RTV or caulk. I think epoxy would be too rigid. Whats the worst that can happen, it falls off and you end up drilling. Just make sure you test the bond before you hit the water.
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