I have one of these, a 1987, coming in the a keel rebed. Have any of you done this or had it done on your boat? If so, what's the keel mating area material? Any sealant used around the keel bolts? If so, what kind? Any surprises when you did yours? This question would likely apply to all of the CS-36 and CS-40's as I'd doubt the materials and practices would change much between the models. Thanks.