Posted by Bengt Blomberg on June 09, 2000 at 17:03:08:
Read the introduction pages of this web site and you will
see that you are right at least in most of your thoughts.
There is only one mistake: The pthtallic acid is not
water soluble and can not be washed away. However other
hydrolysis residues can which reduces the process pressure
to zeero. The water also reduces the heat inducted by
and neccessary for the hydrolysis to proceed. This slows
down the process substantially. The last generation of
boat owners has been brainwashed to believe that the
purpose of the gelcoat is to "protect" the laminate.
In fact it is much more delicate and less water resistant
than the laminate. Its only purpose is to provide a cheap
and durable finish to the top sides.
Epoxy and other "water barriers" are of course less
water ABSORBING than the gelcoat or the laminate but the
difference in PENETRATION when the water is under pressure
from the weight of the hull is far less!
But it will stop process products from escaping and it will
stop most of the cooling effect AND IT WILL OFTEN HIDE
THE DAMAGES IN THE LAMINATE UNTIL A REPAIR IS NO MORE
POSSIBLE. If you are not able to remove acid and uncured
polyester enclosures first, the hull will last longest
if it is sailed with bare laminate and antifouling only.
Now the Netherlands is one of the few countries were the
HYAB Osmocure is already available for boatowners
who wants a permanent ending of the problem.
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