[C320-list] Anti Blister protection

[Adam Weiner]

Another San Francisco weird thing.  What is going on with the list
today?

Adam

-----Original Message-----
From: c320-list-bounces at catalina320.com
[mailto:c320-list-bounces at catalina320.com] On Behalf Of Allan Field
Sent: Wednesday, January 17, 2007 6:13 PM
To: 'C320-List'
Subject: Re: [C320-list] Anti Blister protection


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