[Public-List] Barrier Coats and Blisters

George Dinwiddie gdinwiddie at alberg30.org
Fri Mar 20 04:36:20 PDT 2009


After two or three years, the hull should be pretty dry.  It's not 
likely to do anything radical, barrier coat or no.  I'd leave it the way 
it is.

  - George

Jeffrey wrote:
> Hi Everyone,
> I bought the boat 16 months ago, and will be putting it in the water for the
> first time in two or three years. I've begun the process of removing VC17
> bottom paint so I can apply something suitable for salt water.  Under the
> VC17 I'm seeing what looks to be a gray barrier coat, and lots of little
> blisters, all less than 1/4 inch. The blisters are not wet or pop-able. I
> can't tell if the are old, older than the barrier coat or came after the
> barrier coat.
> Anyway, I need to decide what to do.  From all my reading on the subject,
> barrier coats are the way to go, based on common consensus. A couple weeks
> ago my plan was to strip off the paint to gelcoat, and add an epoxy barrier
> coat before repainting. Since then I've found these small blisters, and what
> appears to be a previously applied barrier coat. I went and read every
> single email in our mailing list email archives with anything to do with
> blisters and barrier coats. It would seem A30s don't like barrier coats.
> Many posts of people adding barrier coats only to get blisters shortly
> afterwards. Many in the list who don't have barrier coats - have no
> blisters.
> Some of the emails I had read in the archive were fairly old, and I'm
> wondering if the opinion is any different today. Are there any folks out
> there that had blister problems with bare gelcoat, then added an epoxy
> barrier coat and it solved the problem? Do I...
>    1. strip the barrier coat and repaint (perhaps fill some of the little
>    craters first),
>    2. strip barrier coat and add new 2009 technology barrier coat,
>    3. leave the present barrier coat and repaint.
> If anyone is interested, I've got a photo of the blistered hull here:
> http://picasaweb.google.com/lh/photo/7yBDtHzbaYagcz09224_WQ?feat=directlink

   When I remember bygone days                         George Dinwiddie
   I think how evening follows morn;            gdinwiddie at alberg30.org
   So many I loved were not yet dead,           http://www.Alberg30.org
   So many I love were not yet born.
                'The Middle' by Ogden Nash


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