ORIGINAL: danj31
Peel ply is not suppose to stick to your fiberglass part, it soaks up all of the extra epoxy and you pull it off and throw it away. That would be a bad choice for hinge material.
The epoxy makes effectively thousands of little rivets through the hinge material. I'd love to see you pull one apart without destroying the rest of the structure first. I can show you pictures of exploded wings (from flutter and collisions with terra-firma) where the peel-ply hinges are still intact. But, whatever floats your boat.