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Osmosis!! |
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Wieland1 
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Joined: 16 October 2013 Location: Willemstad Status: Offline Points: 48 |
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 Topic: Osmosis!!Posted: 21 October 2016 at 14:12 |
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My Hanse 312 from 2004 has Osmosis. My friends in Germany, greifswald who are at the
moment stripping the underwater hull of old layers of antifouling told me this. I have not seen it myself - I live in the UK - but will travel to greifswald next week to have a look myself. I have checked with Fox's Ipswich and Wrede Hamburg/Greifswald via email for quotes to fix this. Wrede Greifswald quotes Euro 8800, Fox's quotes Pounds 6200. Question: Am I the only 312 owner with this problem? I have checked previous topics and not found anything! Any comments/Suggestions , please? Thank you! |
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Wieland1
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Forth2
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Joined: 23 October 2016 Location: Finland Status: Offline Points: 77 |
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Posted: 23 October 2016 at 07:40 |
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It could just be bubbles in the epoxy primer.
I had Osmosis like bubbles on my rudder. These were actually bubbles in the epoxy primer. I removed the old epoxy primer and primed the rudder again. No bubbles seen since. So check again before deciding what to fix. Mike |
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Sailbonbon
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Joined: 07 September 2011 Status: Offline Points: 26 |
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Posted: 23 October 2016 at 10:53 |
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My 312 has only e few bubbles at each side of the rudder. Situation is stabil since 3 or 4 years. I do not believe that this is osmosis. No bubbles or any osmosis indication sign on the under water ship.
Recommed you to get a second opinion by an independent expert. Can anyone help with a contact. |
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Sailbonbon
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Wieland1
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Joined: 16 October 2013 Location: Willemstad Status: Offline Points: 48 |
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Posted: 26 October 2016 at 21:33 |
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thank you sailbonbon and forth 2
As I have just been told via email by an engineer in greifswald it is not osmosis after all the bubbles come from water trapped between gelcoat and epoxy primer Question: Is it the case for all Hanse 312 that they have an epoxy primer layer between gelcoat and laminate? does anybody know please? thank you in advance for feedback!! Wieland
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Wieland1
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hanno
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Joined: 25 March 2010 Location: Finland Status: Offline Points: 42 |
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Posted: 27 October 2016 at 04:38 |
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Typically when you have water between the epoxy primer and gelcoat it's referred to a setup where your primer is getting old and you need to redo it. Totally normal. The crossection is sea-antifolding-epoxy primer-gelcoat-fiberglass. So if the yard said there is water between the glocoat and primer I would assume it's on the safe side, and the work needed (no hurry) is to remove the paint and add the 6-8 layers of new primer + antifoulding. This is something that needs to be done to every fiber glass yacth every 10(?) Years.... (well it's queastinoble do you need to do it with epoxy yacths....
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370e prev 320#429
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Wieland1
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Joined: 16 October 2013 Location: Willemstad Status: Offline Points: 48 |
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Posted: 27 October 2016 at 14:21 |
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thank you very much Hanno for this very helpful answer!
the pictures they sent confirm what you are saying: the gelcoat (blue like the topside) is visible through
the bubbles (when they are poked open) in the grey epoxy primer. So the primer can be sanded off during winter layup and new primer plus antifouling painted on in spring - as you suggest thanks Wieland |
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Wieland1
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