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While over kill I am going to coat the inside of the drain holes with thickened resin so even if a washer failed it would not matter. I am going to replace the way everyone recommeds with 3M 4200 and all.

You can get small amounts of expoxy resin for pretty cheap. The one thing I have found in restoring my whaler is the only issues were where the factory did not seal up a cut into wood such as the rigging acess into the deck. If it had not been for that the deck would not have rotted.