Osmosis treatment

[Guest]

Hello!

New user of board so apologies if nettiquette not so hot...

Anyway we need to get osmosis done on our 20 year old Ohlson 38 based in Carlingford. I see James Jermain in YM Nov 03 gives a figure of £4K for osmosis treatment but I am being given quotes of £6K plus....

Can anyone recommend a yard/person either in NW or Scotland or South Coast who can do a reasonable cost osmosis treatment???

Thanks!
Ronnie Munck

<hr width=100% size=1>'Irish Mist'
(Ohlson 38)
Carlingford

 

[ccscott49]

Try Glasson basin yacht co. At glasson basin, Glasson Dock, Lancaster. Ask for Charlie.
Not a long way from you, in the Morcambe bay area, river lune.

<hr width=100% size=1>

 

[brianhumber]

How bad are the blisters?
No point in doing this work too early as the Osmatic action will continue untill all the ingredients in the resin have migrated to either the internal or exterior surfaces.
No boat has yet sunk from this so, do not be in too much of rush to spend your cash unless you want to sell her of course.

<hr width=100% size=1>

 

[Guest]

Hayling Yacht Co.

http://www.haylingyacht.co.uk/

Tel : 02392 463 592

PM me and I'll help......

<hr width=100% size=1>Nigel ...
Bilge Keelers get up further ! I came - cos they said was FREE Guinness !
/forums/images/icons/cool.gif

 

[Guest]

Thanks!! Will follow up OK....

<hr width=100% size=1>'Irish Mist'
(Ohlson 38)
Carlingford

 

[Guest]

Well no blisters to be seen except sporadically on the rudder. But survey says osmsis in 'final' stages..So why put off doing the treatment which will eventually be necessary? Take the point about not sinking though....

<hr width=100% size=1>'Irish Mist'
(Ohlson 38)
Carlingford

 

[poter]

If there are no blister's how has it been determined that there is osmosis??? & who did the survey?

poter

<hr width=100% size=1>

 

[norseman]

Had a survey done on my boat before I bought her, she was taken out and put back in, in my absence . The sellers said she had a !slight! touch of osmosis, this was confirmed in the surveyors report as small blisters approx., 8- 10 m/m midship a metre below water line. Negoiated a reduction in price and bought her. Hauled her out next winter and was quite keen to see these blisters for myself. Pressure washed her scraped and cleaned antifoul off and started looking for blisters. I looked others looked no blisters could be found. Insisted that the surveyor come and show me these blisters, he looked and looked and could!nt show me anything, embarrassing or what. Get another opinion, if the only thing on your hull is high moisture content readings it might just need dried out or be in the very early stages of osmosis. IMHO>

<hr width=100% size=1>

 

[vyv_cox]

I assume this is based on water content, if there are no blisters. In this case, don't assume that the treatment will ultimately be necessary, it won't. There are an awful lot of people out there trying to get your money off you and those flogging osmosis treatment are a prime example.

I know two boats, one of them mine, that showed high hull water contents indicating imminent osmosis problems. A winter of drying out, assisted by some radiant heating and a coat of Gelshield 200, has staved off the imminent attack for 10 years now, in both cases.

<hr width=100% size=1>

 

[norseman]

Sorry also meant to say that a friend of mine got an expensive osmosis treatment done to his boat, he didnt go for the higher price which included the guarantee. Anyway the blisters are back, and he is now arguing with the people what dunnit.

<hr width=100% size=1>

 

[Guest]

We are now getting a view emerging that high moisture readings do not necessarily mean osmosis. That makes sense. Drying out thoroughly and scraping down should me a minimum action before going to full osmosis treatment on the basis of a surveryor running a moisture meter over the hull. However we are also told that all boats after 15/20 years develop osmosis. It is clearly irreversible as a chemical process so how wsie is it to slap Gelshield over it.

<hr width=100% size=1>'Irish Mist'
(Ohlson 38)
Carlingford

 

[ccscott49]

Older boats do not neccessarily develope osmosis, it depends how they were built and also by who and with what. But of course peeps is right, high moisture does not mean the boat will sink, however how did the water get in there? By osmosis! The blisters are caused when the substrate becomes saturated and the water inside forces the layers apart. Drying out every year for five months helps to stave off this blistering or stops it becoming worse, if you can leave your boat out for a season to dry right out and then put on the epoxy treatment, you will help to prolong the life of the hull, it basically stops or slows down to a minor seep, the water entering your hull. Theres a vacumn bagging/heating system available now, which accelerates the drying out process, I dont know how much it costs, but you can bet it wont be cheap. All this is IMHO.

<hr width=100% size=1>

 

[apollo]

Me too

I had a survey done two years ago when I bought the boat and it too said osmosis.

Have just hauled out for the first time and far from the liberal spread of 10mm blisters, I cant find any.

I have found the 3 or 4 areas where he scraped back to the gel coat and these are the smoothest bits on the whole bottom!

Is this not just another part of surveyors protecting their backs and if the boat is over 20years old, they just say it has osmosis regardless?



<hr width=100% size=1>

 

[norseman]

No I dont agree that all boats 15/20 years old have osmosis, some are fine,but what I would suggest is that most surveyors take that line and err on the cautios side when surveying boats of that age. All boat hulls absorb water, its when the water hits the uncured resins ( faulty build ) the trouble starts. I think I am right in saying there are more cases of osmosis in the Med., than here where they are left in the water much longer. Do a google search on Osmosis and believe me you will be reading about it for the next three days.Yes your first action should be to dry her out completely, scrape and clean and see what you have got.
Cheers
Norse.

<hr width=100% size=1>

 

[wooslehunter]

I went through this earlier this year. True, a boat has never sunk due to osmosis. It's only a real problem if you want to sell. Hence you may chose to negotiate a deal and then eventually sell yourself under the same conditions.

I walked away from two boats that had obvious osmosis though. One had loads of blisters everywhere other didn't. What I bought was an old boat with no blisters, relatively high moisture and a good coat of epoxy paint. I'm expecting blisters at some time though.

If there are no blisters then check with the surveyor. It's often the case that they are treated as they form: popped, dried out locally with a hair dryer, filled and epoxy painted over the top.

You can normally see blisters under the anti-fouling. I had a boat surveyed that appeared flat but on survey showed various colours of flaking epoxy paint underneath the antifouling. I walked from that one since it showed lots of other hidden problems as well.

Good luck.

Dave

<hr width=100% size=1>

 

[Neal]

Speak to technical dpeartment\'s at..

Blake's, International and West.

I did this a few years back, and they were all extremely helpful. I was somewhat surprised that their advice was unanimous - despite my surveyor's assertion that ful:l peel/ blast/ dry/ epoxy was needed imminently, they all told me to leave it till the blisters were much larger (if that ever occurred).

Also, take a look at yachtsurvey.com for an inside opinion.

So don't spend huge amounts unless you want to!

Good luck.

<hr width=100% size=1>

 

[mldpt]

Hi There. sorry to hear about your osmosis, I am at this very moment waiting for the hull of my 15 year old Westerly Corsair 36' to dry She was pealed on the 19th August and I imagine it will take 8/12 months to dry. My quote was for £4290.00 But you must remember most yards will charge a storage charge equevalent to mooring fees. I have every faith in Glasson Basin Yacht Co Near Lancaster not too far across the Irish Sea A nice trip to IOM and then 60nm to Glasson Dock their phone Number is 01524 751667 You need to speak with Mrs Barbara Laythem the owner the workmanship is in my opinion good.
Regards Mike

<hr width=100% size=1>www.sailingforfun.co.uk

 

[wishbone]

Hi Oisin,
Can you view my post, "what dose the team think"
Your help would be appreciated.

Kind regards
Wishbone
Rolling, rolling, rolling keep them doggies moving!
Where’s me chuck wagon gone?
you can pm if you wish!

<hr width=100% size=1>

 

[Nich39Nige]

I own a Nicholson 39 which was built in 1977. Bought her 19 months ago and the survey gave a clean bill of health with regard to osmosis. In fact the only evidence of any moisture was in the rudder. Partial refit in C&N yard last winter and still was still dry. Not all 20 year plus boats suffer!

<hr width=100% size=1>

 

[vyv_cox]

Re: Speak to technical dpeartment\'s at..

My experience too. International were helpful and gave almost totally conflicting opinions from those of the people who wanted to sell their services.

<hr width=100% size=1>