> I went to your link to the pictures of the strip whitewater/openwater boat
> and noticed dark strips where the grabloops and desklines were attached to
> the deck. Is that extra reinforcement, or are the mounting points
> recessed? If so it looks like a neat detail.

Put your test pieces outside in the sun and try again in a year or two. The only time I have seen failures of this kind in any boat using any resin (polyester or epoxy) has been after the boat has seen some use.