Join Date: Dec 2005
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I had a small section at the bottom of an anchor locker that was below the drain hole, and was successful in simply pouring some mixed epoxy in until it got to the desired level. The only caution is that epoxy creates heat as it cures, so don't put in too much at once--the heat could cause problems for other things in the vicinity, or could cause the new stuff you pour in to crack as it cures. I would suggest doing it in layers, perhaps about a 1/4" at a time, let that cure and then mix and pour more until you reach the desired level.
Although it worked fine for me, I'm no expert on this, so it's only a suggestion for consideration.