Drying out period - is there a minimum?

[Cobra750]

Is there a recommended (or considered) minimum period one should allow GRP yachts to dry out for?
Thanks

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[Guest]

If this is allied to Osmosis ....... then all that really dries out is any moisture able to wick or seep back out .... the real problem moisture deep seated and already increased density and viscosity will not come out..... that is the reason for gel-pealing / blasting etc.

So answer is there is no minimum or maximum ......

Like most you will probably lift for 3-4 months over winter ....


<hr width=100% size=1>Nigel ...
Bilge Keelers get up further ! I came - cos they said was FREE Guinness !
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[maxi]

Agree with nigel_luther, if you have an osmosis problem then you have to remove the products of hydrolysis as the first step in the cure.
You should be aware that lots and lots of boats have elevated moisture levels without ever developing osmosis, so think carefully before spending your hard earned cash - but don't put epoxy over a wet hull, that may very well create it's own problems.

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[Norrsken]

International Paints recommendeeda minimum of six weeks to let the water dry out on my boat. It was expoxied before first launch.

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[ashanta]

If you epoxied the hull before launching it would be assumed that a meter reading was taken that confirmed the water content of the hull was at or below the recommended level prescribed by International paints. If not, as the previous person said, you will be locking in the water and severe problems will created as a result.
A high water content (15-17) will not reduce significantly during lay up thats why the boatyards use infra ray heating to speed the dying process before epoxying.

Regards.

Peter.

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[Novice]

Are you saying that a brand new boat will have a high moisture content in the hull? I read the post to mean that the hull was epoxied when the boat was brand new and before being put in the water for the first time.

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[Guest]

I think that here the post is talking about launching from storage - not from new .....


<hr width=100% size=1>Nigel ...
Bilge Keelers get up further ! I came - cos they said was FREE Guinness !
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[ashanta]

Yes, I was referring to the original question which I assumed was a vessel already holding water during the laying up period. I would not want to epoxy a hull with a significant water reading. I think the blakes guarantee is only given if the recommended boatyard reduces the water content to a figure of 3. (not sure which scale) Otherwise the physical signs of osmosis will be accelerated.
Regards.

Peter.

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