Answer to Hans Mulder


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Posted by Bengt Blomberg on May 29, 2000 at 09:09:41:

My advise is to peel or sandblast away all of the
gelcoat. Then the outer laminate layers will be somewhat
porous and uneven but might be uneffected by hydrolysis.
The only nearby site this can be reliably checked is
Mallorca, but that yard is specialised at larger yachts
and both checking and eventually repair becomes a bit
expensive for a small old yacht. HYAB is planning two new
Centres on the Spanish south east coast, and if you are
planning to go there it might be worth to wait if you
are willing to spend around ESP 50.000.- /square meter
for a proper repair. Then just apply antifouling on the
rough laminate and sail until it can be done.
Or you can use a glass bean based epoxy filler, sand it
even, apply a one component primer and antifouling only.
After a couple of years, when you are sure about liking
the boat, you can check if there is any hydrolysis acids
which call for a proper repair.
I know that is difficult to find glass bean epoxy filler
in Spain but you can contact the HYAB representant at
e-mail hyab@osmocure-sl.es or mobile 0034 609219944 and
ask him to send what you need. I would think 15 - 20 kg
And remember, don't let anyone led you into applying
any kind of watershield as long as there might be any
acid residues in the laminate!!!! Water in itself does
no harm to the laminate.
Regards Bengt Blomberg


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