[C320-list] Anti Blister protection

[Allan Field]

Ken - The one thing I am unsure of was when Catalina switched to vinylester
but I believe that all C-320's are vinylester.  Perhaps someone else knows
for sure.  But you are right, boats made in the 70's and 80's in particular
had blister issues.  My old boat was a 1981 and like I said before, required
a complete peel, 6-months for the hull to dry out, then a new lay-up. -
Allan

-----Original Message-----
From: c320-list-bounces at catalina320.com
[mailto:c320-list-bounces at catalina320.com] On Behalf Of K L
Sent: Thursday, January 18, 2007 1:38 AM
To: c320-list at catalina320.com
Subject: Re: [C320-list] Anti Blister protection

I was in a sailboat partnership in the 1990s with a 1985 catalina 30. When 
we sold her in 1999 she had thousands of blisters. Ok, maybe that was a 
slight exaggeration but she did have the pox bad. Real bad.

Ken Danko
802, Grace



>From: "Allan Field" <Allan.Field at comcast.net>
>Reply-To: Allan.Field at comcast.net, C320-List <c320-list at catalina320.com>
>To: "'C320-List'" <c320-list at catalina320.com>
>Subject: Re: [C320-list] Anti Blister protection
>Date: Wed, 17 Jan 2007 21:13:09 -0500
>
>Stephane - Blisters, as I understand them, are caused by the inevitable
>migration (think osmosis) of water into the hull where the water reacts 
>with
>the resins (polyester?) that used to be used in layup.  This reaction
>created an acid which then ate its way back out.   Once you actually see a
>blister, the internal damage has been done.  That said, there is no case on
>record of a boat sinking due to blisters, at least as of about 6-7 years
>ago.
>
>The hull on the Catalina is laid up with vinylester resin from rubrail to
>rubrail; most production boats now use vinylester from waterline to
>waterline so kudos to Catalina.  Water migrating into the hull does not
>react with vinylester resin to create an acid thus supposedly no blisters.
>According to Gerry Douglas, Catalina designer, there have been a very few
>cases of very minor blistering with Catalina's but none in the past few
>years.  That said, I am not sure why Catalina's hull warranty is only 5
>years and pro-rated per year at that.  Regardless, after having gone 
>through
>an 8K complete peel down and re-layup on my previous boat, I am 
>particularly
>sensitive to this issue.  At the end of the day, I have decided to trust
>Gerry and not go through the time and expense of doing a barrier coat.
>Seems to me it would be akin to wearing a belt with suspenders.  Just my
>thoughts...
>
>According to informed but anonymous sources, the only boat that Catalina
>ever made with non-vinylester layup was sold to a woman in the San 
>Francisco
>Bay area who bought it for her boy-toy.  But this may just be another urban
>legend...
>
>Allan S. Field
>Sea Shadow - #808
>Columbia, MD
>
>-----Original Message-----
>From: c320-list-bounces at catalina320.com
>[mailto:c320-list-bounces at catalina320.com] On Behalf Of Stephane Rousseau
>Sent: Wednesday, January 17, 2007 3:14 PM
>To: c320-list at catalina320.com
>Subject: [C320-list] Anti Blister protection
>
>Hello,
>
>I have a Catalina 320 1998, this year, I have remove all the antifouling on
>the bottom. It can be a good time to make an antiblister protection
>(Interprotec). I know that some boats and years need it. Does Catalina320
>boat need this protection to be added?
>
>Thank
>
>Stephane
>
>
>

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