[Public-list] barrier coat

[John Birch]

Awlgrip can't be water immersed, even a long passage, like a trans Atlantic 
on one tack will cause blistering - its the awlgrip not the gelcoat 
blistering.

----- Original Message ----- 
From: "John Malthouse" <jmaltcontact at hotmail.com>
To: <public-list at alberg30.org>
Sent: Thursday, May 25, 2006 2:22 PM
Subject: [Public-list] barrier coat


> Thanks George,
>>From what I have been reading your analyses seem to make sense to me.
> My A30 has very small pepper blisters above the water line. I believe they
> formed due to last springs cleaning before launch, stooped me used acetone
> to remove old wax before doing three stage compound polish. (a beginner) 
> Any
> suggestions regarding this repair would be greatly appreciated. Also above
> the waterline near the forward port bulkhead is some fine line
> cracks/blister horizontally (outside hull), Both conditions seem to be 
> only
> in the gel coat. ANY SUGGESTIONS?
>
> I am working on the smaller 22 ft first in order to gage my skills and
> knowledge, This one had several blister just below the water line and when
> excavated more were found, so that now I have an 4" strip from bow to 
> stern
> where I have ground down to the first layer of glass or a bit more. The 
> plan
> is to use the WEST EPOXY ,HARDENER AND MICRO FILLERS. In all that I have
> been reading one should wet out the exposed glass with epoxy and hardener.
> Does this not create a barrier?
>
> Back to your comment on barrier coats stopping water molecules from 
> exiting,
> Interesting enough it seems that the area of blister seem to be where the
> previous owner had over sprayed when he painted with ALGRIP?
>
> Boy do I ramble: suggestions welcome , do not want to damage my A30
>
> thanks: John / Mannin #452
>
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