Join Date: Jun 2006
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Seeing as it's straight fill, you can make the first layers with chopped mat and/or microballoons. You could finish by wetting out fg tape and overlapping it up the sides of the bilge, which should keep water from ever getting beneath it
If this is a concern, however, or if you have no boat cover or you haul in a place where water is likely to freeze, consider boring a "garboard drain" to the outside with a close-fitting plug. Remove the plug in the fall and water drains straight out.