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Last year about this time I took a couple of tubes of latex plus silicone house caulk and filled the gap between the bottom of the rubrail and the hull. I first brushed and pressure washed the crud out of the crack. On our 1987 boat that was a gap about 3/16 to 1/4 wide and about the same deep. I brought the boat into the shop last weekend to clean it up for this year and was amazed at how much cleaner the topsides were with out the crud falling out of the crack and the spiders and so forth living in there. Cheap, easy, and effective. Dave
Good question, Steve. That is a major (and hard-to-correct) point of infiltration for water into the cabin. I have often thought of caulking the TOP of the rubrail, but never the bottom. I haven't, because every time I was about to start, there was something else that need to be done more urgently. Besides, I was dubious it would solve the infiltration problem. Anyone else have any experience with this problem?
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.