Subject: baidarka R: Re:Polyurethane
From: Stefano Moretti (stmoretti@tin.it)
Date: Fri Dec 15 2000 - 06:02:20 EST
All polyurethanes are vapour permeable. If I'm correct only epoxy has a
chemical structure grid that does not allow vapour to go through.
Stefano
----- Original Message -----
From: Mark Starr <marks@mystic.org>
To: <baidarka@lists.intelenet.net>
Sent: Thursday, December 14, 2000 9:39 PM
Subject: Re: baidarka Re:Polyurethane
> Dear Bill,
> I had written to you before about polyurethanes for nylon skin boats, and
> tried the Zar exterior oil based satin polyurethane on the boat I just
> completed (3 coats, applied inside a heated finishing room). After using
> the boat a few times, and having left it with a little water in it out in
> my unheated barn, the skin buckled up over the entire hull (it was drum
> tight up till then). After bringing it onto a glassed-in porch, the skin
> has shrunk back to its tight state. I am assuming that the urethane is
> waterproof, but vapor permeable. Has this been your experience with this
> Zar product, or did I somehow mess up the process? I can go back to the
> Duratuff, but it is quite expensive, and I would like to find something
> easier to get as well. Thanks for any light you may be able to shed on
> the problem, and happy paddling!
> Sincerely,
> Mark Starr
>
>
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