Subject: RE: baidarka Re:Polyurethane
From: Connolly, Paul (AZ15) (paul.connolly@honeywell.com)
Date: Thu Dec 14 2000 - 13:06:24 EST
Hi Mark,
I don't have experience with the Zar product - but my nylon skin is coated
with Varathane Water-based exterior satin. I expect it exhibits similar
characteristics. How thick is the Zar? 3 coats of the Varathane was just a
start. I think I put >=10 coats of Varathane on. The Varathane goes on
quite thin. It's pretty nice stuff. No nasty and dangerous fumes and it
goes on very smooth. I didn't do any sanding and had 0 brush marks.
I haven't had any problems with the skin on my baidarka "bagging" out. It
loosens up a bit in the water and tightens a bit in the sun - but nothing
serious. However, I live in the desert climate of Phoenix. We get 30
degree temperature swings - but no below freezing weather.
I'm glad your skin shrank back down for you.
Enjoy,
PC
-----Original Message-----
From: Mark Starr [mailto:marks@mystic.org]
Sent: Thursday, December 14, 2000 1:39 PM
To: baidarka@lists.intelenet.net
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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