Join Date: Jul 2010
Location: Gig Harbor, WA
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I don't think you should try and seal it up with a wet core.
I can't tell if the port lights are in place or removed. If you can seal the boat up, I would put a dehumidifier in the boat, with the drain hose going into a sink drain. Put some additional fans in the boat to keep air moving. You will need to make sure that no more water gets in the core, and that might mean removing any deck hardware that is leaking and temporarily sealing the openings.
Then, I'd drill holes through the fiberglass on the underside with a hole saw in the areas that are wet, 1 - 1 1/2 diameter. The dehumidifier and fans will do a very good job of drying the inside of the boat out and the core should dry as well as long as you have enough openings.
But then I'm likely wrong....
M/V Kinship, North Pacific 43
S/V Legacy, Catalina 400 MkII, Hull #328