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Old 04-12-2014, 10:11   #16
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Re: Osmosis repair, what to expect

Originally Posted by minaret View Post
Except that FP generally only covers blisters below the waterline, and many of their boats blister everywhere.
The OP stated this was a bottom job and that FP was covering it.


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Old 04-12-2014, 10:31   #17
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Re: Osmosis repair, what to expect

Originally Posted by minaret View Post
So not true. Blisters are a symptom of a disease, osmosis. A later symptom of the same disease in its more advanced stage is hydrolysis. Any boat with osmosis and salt water saturation will eventually hydrolize if the process is not stopped. This will lead to delamination. Might take 50 years, but leaving a boat saturated long term is a death sentence.
I hate the word "osmosis" which by definition means you have fluid on both sides of a permeable membrane. If your permeable membrane (hull) has water on both sides you have bigger problems than blisters. And what the hell does "the slight beginnings of osmosis" mean ?

There are many different types of blisters and not all lead to hydrolysis.
Check out "Osmosis Testing".
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Old 04-12-2014, 10:35   #18
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Re: Osmosis repair, what to expect

Originally Posted by zboss View Post
One of my closest sailin friends is a 20 year circumnavigator. He and his wife pulled their downeaster out at the same time as our CR a few months ago. I asked him how long he was planning on being on the hard and he answered "we only have about a 100 blisters this time, so about two weeks".

My jaw hit the floor.

Sure enough, they used a grinder and ground down their 36 year old boats bottom only where the blisters lay, let them sit for a few days then filled them in lickity split, painted with barrier coat and new bottom paint and they were down in Miami before I could even get my jaw off the dirt. All by themselves and they weigh maybe 200 pounds between them.

Basically, he explained to me that 99% of blisters are just cosmetic and he never bothers to go through the blister repair. I've heard the same from a lot of people.
Yep, I've done this (or similar)and know many who have. There are three camps and neither is wrong IMO.
*One camp would peel the whole boat, probably spend at least 6 months out and spend 5 figures on a new bottom. They may not even reapply more fiberglass when doing this. Most the peeling I've seen takes 1/8 to 3/16 of material off. That may be 10-15% of hull thickness depending on the boat. On many boats this is OK, but some boats are not as thick as you might imagine!
*The other camp does as mentioned above by the in the quote. Grind them out, wait for any wet rings to disappear, fill and epoxy.
*The last camp grinds them out, removes all paint, wait for any wet rings to disappear, fill and epoxy coat the whole bottom.
I've done all 3. Still undecided.
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Old 04-12-2014, 20:03   #19
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Re: Osmosis repair, what to expect

Thanks for all the great responses, gives us something to consider. Yeah the best thing would be to be there where the boat is but this may be impossible for us at the moment.

I agree with "colemj"

Originally Posted by colemj View Post
...I would want to see FP's specific response to the owner, along with any other communications, instructions or recommendations involving FP. I would also like to see the yard estimate, work order, and actual bill at the end. Just to make sure that all was on the up and up, and not a collusion to sell a boat.
When we first started researching boats some time ago we were drawn to certains boats including the FP's. After attending a boat show and reading about FP's ongoing osmosis issues we said forget it, not worth the hassles as there are many other great boats out there.

Yes this happens to many boats but with the given history FP has, one has to question. He also stated that because of this history, FP would cover a full bottom repair not just blisters here and there.

As for:

Originally Posted by boatpoker View Post
... And what the hell does "the slight beginnings of osmosis" mean ?
Maybe I should have been a bit clearer. The owner said on the last haul out they found blisters. Somehow someone present said something that turned into FP doing a whole bottom job. So yes a few blisters but can you blame someone for jumping to conclusions that its on its way to having an osmosis issue if not taken care of, given their history?
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