[Alberg30] barrier bottom protection

[SandersM at aol.com]

In a message dated 5/10/02 8:39:54 AM, gdinwiddie at min.net writes:

>My own theory is that the gelcoat tends to be porous enough
>to let the hydrolized resin byproducts pass back out of the hull
>into the water.  I know that my own boat, when I used a hard bottom
>paint (Pettit Trinidad) used to get small blisters in the paint,
>not the hull, as if the osmotic flow was stopped by the paint
>instead of the gelcoat.  For whatever reason, some of the worst
>blistering problems I've heard about on Alberg 30's has been
>right after they were barrier-coated.

George, what you say has a lot of merit.  When I got my Chris Craft, her hull 
was bare, and I contemplated laying on a barrier coat before painting with 
antifouling.  The surveyor strongly urged me not to do so.  He pointed out 
that the hull had weathered more than 30 years in its current state without 
blistering.  He noted that the lay-up is porous, that water migrates into and 
out of it.  By laying on a barrier coat, you interrupt that flow, with 
unforeseeable consequences.  He said that no one could explain exactly why, 
as the environment surrounding the untreated membranes hasn't been studied 
enough for certainty.  But he theorized that water still enters the layup 
from the interior of the boat, and the exterior barrier traps it there.  His 
bottom line was "If it ain't broke, don't fix it."  

Sanders McNew
Member Emeritus
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