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Hope the cement sets for you. If you can get some matt thru the hole to the concrete side of the hole it might help hold the fiberglass repair in place. They also have loose glass fibers that you can add to the epoxy to give it some added strength. Good luck.

If I was repairing a boat I would want to grind away the existing fiberglass about 3inches around the hole to provide a good strong bond. I would not just overlay a single layer of Matt, but build up several layers of Matt right through the full thickness of the hole. No cement. I would use...