Step one is eliminate the water intrusion. The water was given a pathway in. Once inside the core, water travels to an equilibrium point, which may be far away from the point of entry (downhill eh). You gotta think it over, think uphill till you find it. First explore the usual suspects; thru hulls, exhaust tube, what else is ON the hull not the deck. The deck is an entirely separate piece and issue. Drilling holes sporadically does not work. Do not put any time or money into that. I spoke with three people this summer who are re-doing their boats this year, boats which were drilled in that manner. Peel the outer skin off the hull (there is a tool for this), suck it dry, leave a tarp up over the work area to "tent" it to prevent weather from getting in, but open at the bottom not trapping more moisture inside, let it air dry further after vacuuming water off the core, get it dry, for sure. Get to the exposed core, get it dry without question. Build it back with epoxy products.
