regatta
The proper, strong way to close a hole like that - I am guessing 2" to 3" in diameter - is as follows:
Grind a taper all around the hole top and bottom. The taper should be ideally a 12 - 1 bevel but you may not have enough room so make it as large as you can up to that amount. If the deck is not cored a puck of thickened
epoxy will fill the middle section. If the deck is cored a circle of plywood can be used. Then circles of fiberglass cloth ( I would use 1708 biax both for its strength and because its thickness builds faster than with thinner materials) are added with the largest first, working to the smallest. Use
epoxy for its better secondary bonding strength. Fair with
epoxy mixed with a filler like West 407, sand smooth and
paint.
The West Fiberglass Boat
Repair and Maintenance guide can be downloaded here - scroll down a bit.
WEST SYSTEM | Use Guides
Here is a diagram of what you are trying to achieve for strength and durability.
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