[Public-list] Bottom Job

[Roger L Kingsland]

George,

148 has been inside for 15 months ("the wheels of progress...").  I water
blasted the interior a year ago and ran a dehumidifier for a few weeks
after. Even if I barrier coat the bilge, I still wonder if it is possible to
keep water out of the keel.  I understand the keel laid in epoxy but is it
particle to assume water from the bilge will not infiltrate the area between
the cast iron and fiberglass?  Can I assume if I discover few blisters after
removing all paint that a barrier coat is unnecessary?

Roger

----- Original Message ----- 
From: "George Dinwiddie" <gdinwiddie at alberg30.org>
To: "John Irving" <a30blueteal at gmail.com>; "Alberg 30 Public List -- open to
all" <public-list at alberg30.org>
Sent: Thursday, January 20, 2005 1:21 PM
Subject: Re: [Public-list] Bottom Job


> I'll second that opinion.  I've known of a couple A30's that had more
> problems after barrier coating than before.  In general, A30's don't
> blister much.  My theory is that the gelcoat is so porous that the
> hydrolyzed resin byproducts pass back out through the gelcoat without
> lifting it.  Also, keeping the bilge dry seems to correlate with lack of
> blistering problems.
>
> In any event, for a small area, I would just grind and fill those
> blisters.  I've never known of an A30 to have blisters to the point of
> threatening the integrity of the hull.
>
> If you do decide to barrier coat, you'll need to really dry out the
> boat, much more than just a winter on the hard.  Maybe a winter of
> vacuum drying or a year of covered storage.  Maybe more.  And I'd
> suggest that you barrier coat the bilge, too, as I think that water
> penetrates just as much from the inside if you let it accumulate in the
> bilge.
>
> I recommend the Drip Less packing described on
> http://www.alberg30.org/maintenance/MechanicalPropulsion/StuffingBox/ so
> that you don't need to let the stuffing box drip.  Store your charts in
> the bilge.
>
>   - George
>
> John Irving wrote:
> > I've been considering an epoxy coat "bottom job" as well because I'll
> > be replacing bottom paint in the next year or so.
> >
> > I got an opinion from a trusted boatbuilder who advised against epoxy
> > barrier coating unless the owner is already making significant blister
> > repairs. He felt that problems can be created by sealing moisture *in*
> > the laminate and blocking its avenue of migration out. He was aware of
> > instances where epoxy coating a hull as a preventative measure
> > actually caused blistering where none existed before.
> >
> > I'd appreciated hearing about the experiences listees have had with
> > epoxy barrier coating.
> >
> > John #284
> >
> > On Thu, 20 Jan 2005 08:41:10 -0800 (PST), Michael Connolly
> > <crufone at sbcglobal.net> wrote:
> >
> >>Roger,
> >>Gougeon Brothers, Inc. publish several booklets that detail procedures
for fiberglass repairs.  One is specific to Gelcoat Blisters.  When I did a
bottom job I found that the Technical folks at Interlux were superb.  Since
you are doing the full Monty I would strongly recommend applying an epoxy
barrier coat of your choice.  I used Interlux products exclusively and have
been very pleased with the results.   Oh yeah..  be sure to visit Popeyes
web site to purchase the final top coat.
> >>Michael
> >>
> >>Roger L Kingsland <rkingsland101 at ksba.com> wrote:
> >>Albergers,
> >>
> >>In asking about "careening ship," I forgot to ask the more important
question. How do I do a bottom job? The deck and topsides are ready for
paint. I have gotten down to the gel coat a few inches below the boot stripe
and discovered a total of about one square foot of blisters. I don't know if
this means I should expect more or the hull is in good shape. Is it
customary to sand blast everything then refinish the hull or should I take
less drastic measures? It was quite a chore getting the few inches of bottom
paint off in the area of the waterline. I used several coats of stripper and
still had to do allot of sanding. I would appreciate any suggestions,
particularly "how to" reference material.
> >>
> >>Thanks
> >>
> >>Roger 148
> -- 
>   ----------------------------------------------------------------------
>    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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