West Systems G Flex epoxy will bind vinyl patches to bare ABS. I am told that Stabond also works very well on Royalex from which the inner vinyl layer has been stripped.
I have heard stories of the hard plastic D ring bases popping off. I have also heard of them creating stress risers at the edge of the plastic base leading to cracks in Royalex hull bottoms. I have not experienced either problem personally, and I have had quite a few boats (some Royalex and some composite) which have had them. I have usually bonded them in with the 3M Scotch Weld 2 part urethane structural adhesive.
Kayak Motor Kit
Paddler's Truck Rack
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