Answer to Loek de Winter

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Posted by Bengt Blomberg on March 21, 2001 at 17:09:39:

Hello again Loek,
The reinforce fibre glass in the laminate can either be made of
chopped fibres like a felt cloth or from long fibre strand bundles
cross woven like a very coarse normal cloth. It has nothing to do
with paint. The first described material is known as "chopped mat"
and the second as "woven roving".
I can't find any recommendation to use epoxy or any other protective
coating in my earlier answer.

Such coatings should be used ONLY after a total removal of acid and
uncured polyester rests in the laminate. Such a removal is what causes
most of the cost. I am fully aware of that you can get lots of offers
about cheaper "repairs" which prevent you from seeing any blisters for
long time, but where the hydrolysis proceeds under the coating and makes
the hull softer and softer without your knowledge.
As long as you can not afford to remove the real cause for the hydrolysis,
the process is much slower if as much water as possible is allowed to enter
the laminate to cool and dilute the agressive substances.

Regarding knowledge about the softening, you can call Mr Tom Schoonhoff at
0654 38 42 37 and he can provide you with names of dozens of owners of repaired
hulls who can explain how soft their hulls were before the repair.

Regarding the time it will take until your hull without a proper repair becomes
too soft, my experience from your specific hull and your description of the damages
My guess is 4-6 years if in the sweet water areas and 8-10 years in the salt water
areas of Holland.
Regards Bengt

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