Subject: Re: baidarka Re:Polyurethane
From: Bill Low (billow@capecod.net)
Date: Thu Dec 14 2000 - 13:44:29 EST
Hi Mark
Well you have the corn cob effect as a little girl said of one of my early
boats. Many people have had this with nylon. I have not been able to pin it
down except that nylon will absorb quite a bit of water and in doing so will
stretch and get baggy. I tried everything to get rid of it. I even coated
the entire inside of the skin to stop any water movement. Didn't work. I
have tried other polyurethanes with the same result. Some have had good
results with heat steaming the nylon before coating. I never tried it after
coating but that might work.
The result was that I changed to polyester skin. No problem of any kind with
that because it won't absorb water. I wish I had some magic bullet but as I
said it is a somewhat common problem. I don't think that the ZAR is the
problem, I think it is how you prep the nylon with heat before coating. But
I gave up on nylon for many additional reasons also and moved to polyester
so I don't know for sure.
Bill
----- Original Message -----
From: "Mark Starr" <marks@mystic.org>
To: <baidarka@lists.intelenet.net>
Sent: Thursday, December 14, 2000 3:39 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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