> I cut out the excess trim inside the cockpit openings of my Tred Avon
> tonight. On a whim, I pulled on some cloth to check adhesion. It peeled
> off nicely, leaving an imprint of the weave in epoxy stuck to the wood.
> Hmmmm....

The fiberglass is stronger than the epoxy. It is not too surprising that when you pull on the fiberglass the epoxy bond to it will break. Pulling on the glass you can create really large localized forces which are probably greater than your boat will be exposed to in regular use.