Here's a photo of the plug that I removed from my H16 hull when I put the deck ports in. Notice that the gelcoat is almost as thick as the fiberglass.
I think I might of misunderstood what Jim was saying earlier. I assumed that when he mentioned the layers of fiberglass coming apart, he was talking about the inside and outside layers. I think he was referring to the actual thin layers of fiberglass that make up the outer shell of the hull. If that is indeed the problem, I understand his worries about this repair method working out.

Jack