Boat osmosis


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Posted by Peter Z on June 21, 2000 at 00:43:40:

I have 28 footer which is 23 years old. It has been built from the chopped fibreglass mat and polyester resin. It has no woven roving in the laminate at all. My boat has something which may be called severe osmosis. Brown fluid seeps from the above water part of the hull and the celling inside the cabin. Where the cabin was painted with the enamel paint small acid bubles form on the surface. On one side of the boat brown fluid seeps in a number of spots located about 100 mm above the water line. I have observed few blisters under the water line as well.
However, I have not noticed any symptoms of the hull loosing its strength. It is rigid and has no cracks between the construction members. This is a swing keel boat and it has a keel case inside the cabin. It shows no stuctural problems at all. It looks to me that osmosis follow the single fibres causing no major structural problems. The colour of the hull is brownish all over the place. In the bilge where water collects all the time it is opaque clear.
I try to find justification for the major repair job but I am unsure if it is worth to do it. I would like this boat to survive another 5 to 10 years and I believe it will.
Would anyone comment on this message?

Peter


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