I have a 1977 Hunter 27' and in reading some of the past post on "Keel Dropping" to replace the caulking , which I have to do , it has been stated to loosen the keel bolts, raise the boat and let the keel lower itself from the boat,then replace the caulking and reverse the process.With all that said ,my question or problem is ,that in removing the old caulking, I see and feel what seems to be resin or some other hard material behind it. Is this just fill or part of the keel structure that will break off if I lower the keel? Thanks for any input. Carter S/V Irish Fox