A lot of the water intrusion on the Mainships can be blamed on Mainship dealers. The boats were shipped out the factory with the railings, mast and bridge shipped loose for mounting at their destination by the dealer. Needless to say, the pieces were installed with varying degrees of quality, depending on who was doing the installing.
My 350 suffered a saturated upper deck due to an improperly installed/sealed radar mast. The moisture wicked out to a 6' diameter around the base of the mast over a period of 6 years prior to me owning the boat. When the fiberglass deck was cut out it was an awful site, balsa mush. It was a big repair, $9,000.00.
Then again, as Chris points out, he had no such issues. My surveyor missed it. Won't use him again because, as I understand, any surveyor worth his weight should be able to detect moisture intrusion.
Good Luck.
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