The previous owner had a life raft bolted to the cabin top. When I got the boat the raft was gone and left behind were twelve holes in the cabin top. Three in each corner where the raft was. The holes were filed with a gray caulking that matched the gray deck very well but I don’t know what it is. I have had the boat for nine years and it has held up that well. But alas one set of three has started to leak. The question is should I drill out the caulk and re-caulk or should I drill out and use and epoxy filler?