I second using Butyl tape - particularly the Bed-it brand. Not sure exactly what your chain plates look like. I resealed my chainplates on my 34 with bed-it in 2020 following recoring the deck in that region and haven't had any leaking since. I suggest making an angled (e.g. 45 deg) cut in the fiberglass around the chain plate on the top of the deck if there isn't one already so that the bed it tape will have some thickness between the fiberglass and the chain plate. Clean the surfaces with acetone or alcohol. Roll a bead of tape and push it in as hard as you can - and add enough so it is sticking up a bit. Then press down the little plate that holds that in place (with a single layer of bedit tape under it) and screw in place gently. Come back and tighten the screws slowly over the course of a few days so that the tape has time to flow. Clean up excess tape around the outside using a sharp knife to cut it around the edge of the metal plate. Nathan 1981 C&C34
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