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Old 31-03-2014, 15:00   #1
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Does sea water in the bilge cause osmosis?

We are always keen at osmosis prevention at the outer surface of the hull. The bilges mostly are only painted, without a barrier shield.
Can long term shaft leakage cause osmosis?
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Old 31-03-2014, 17:08   #2
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Re: Does sea water in the bilge cause osmosis?

Yes. I have even seen blistering caused by water trapped under a teak deck several times. Leaving fiberglass immersed in water long term is unwise. Keep your bilges clean and dry. Another reason I don't like encapsulated keels.
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Old 31-03-2014, 17:31   #3
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Re: Does sea water in the bilge cause osmosis?

had blisters on the inside of one boat below the floor. Not particulary wet in there but damp as they tend to be. Never was sure if they came thu 1.25" glass from the outside or somehow started in there.
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Old 31-03-2014, 17:41   #4
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Re: Does sea water in the bilge cause osmosis?

Boat I just bought has some blistering, and a constant leak at the stuffing box which of course keeps the bilge full to the level the bilge pump switch activates. Surveyor said the two were most likely related and before I did anything to fix the blisters I needed to dry up the bilge first.
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Old 31-03-2014, 17:50   #5
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Re: Does sea water in the bilge cause osmosis?

But but uhhh if the keel is encapsulated then you don't have wet keel bolts, bedding and stainless that's oxygen deprived holding on gasping for air and pitted. Sure if you have a crap layup and crap resin saturation and crap resin you could maybe start dissolving the resin. I wish we would just call the whole blister osmosis thing something else. 1 is my resin dissolving? 2 Is my boat delaminating? Dies my boat have a good resin 3)cloth ratio? Maybe that would help us.


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