Check out my prior posts on the Open Forum by clicking on "HoldenBeachin" at the right then click "show all user's posts". I had a similar problem with one hull on my '76 H16. I had planned to put in deck ports, so when I cut the holes for them I filled the delaminated area with a can of "Great Stuff" foam from the hardware store. I heard from many forum readers who did not think this was a good idea, however, the repair is still rigid after two weeks of hard use at the beach earlier this month, and the foam is not as heavy as epoxy. Good luck.