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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
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  #1  
Old 02-15-2004
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Osmosis

I''ve stripped down to the fibreglass on the underside of my boat, but after 1.5 months of drying, moisture meter still reads 80-100%. Feels dry to the touch, but of course that means nothing. I''ve tented the boat and am running a dehumidifier, but am at a loss for what, if anything else can be done. Tips/suggestions, etc. much appreciate. Also, what happens if I slap epoxy filler/barrier coat on as is? Yes, the hull is saturated, but will the barrier coat keep any more from getting in?

Cheers,
Scott
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Old 02-16-2004
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Osmosis

Scott,

I have been researching this a bunch and still don''t know the answers and it has kept me from buying a boat that I like. If you haven''t been to some of the sites that deal with this issue, try www.osmosisinfo.com or marinesurvey.com. Zahniser''s Yachting Center in Solomons Maryland has an article that they have posted on this subject as well. At www.dockwalk.com you can find a series of articles written by the guys at the University of Rhode Island that did some detailed studies of this issue.

If the hull is saturated, 1.5 months is probably not enough time to dry out. Putting the barrier coat over a wet hull might result in very quickly reblistering and won''t stop any hydrolysis that is going on. Also, I would be sure that the fiberglass laminate layers are all sound before you put on the barrier coat. Now would be the time to strip some of those if necessary. Again, though, I am not an expert on this subject. If you can''t find the material at those sites, let me know and I''ll find the precise links.

Good luck and let me know what you find out as well.

Gerhard


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Old 02-16-2004
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Osmosis

How about running one or more heaters to help expedite the drying process?
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Old 02-16-2004
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Osmosis

Thanks to both. I''ve thought of heat lamps and/or heaters too. I just wonder if it will work. The $s are racking up as it sits on the hard, but at least I have some other things I can do while it''s out of the water.
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Old 02-18-2004
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Osmosis

I don''t know anything about your environment, but maybe I can help.

I use to dry out houses after water & flood damage. First you''ll probable have to put a tent over the thing if it''s in a cooler climate. If it''s in a dead cold climate you’re going to have trouble no matter what. Water will soak into steel in real cold weather. You need to get the boat up to 80 degrees and hold it there. Then get a couple good sized dehumidifiers and let them run & run. If you can''t get the boat up to 80 it''s going to take forever to get the moisture out of it. In addition is the use of fans blowing across the wet parts of the hull, heat speeds up the process? But if your in humid weather that''s a waste of time unless it''s in a sealed tent with dehumidifiers. The perfect environment would be Phoenix, AZ on a windy day.

Imagine a piece of rope in a glass of water. Now do what it takes to the end of the rope to get the water to wick out of the glass.
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Old 02-19-2004
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Osmosis

delmar''s advice is similar to what i have seen in boatyards during blister job projects. they even put a heat source inside the hull to force the water out.
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