Answer to Ralf Edwards

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Posted by Bengt Blomberg on January 20, 2001 at 08:59:55:

Hello Ralf,
I could write you a book about the gelcoat devellopments since
the late 50ies. It can influence the size and form of the blisters
or even be thick and hard enough not to blister at all but it has
nothing to do with the hydrolysis process. And the hydrolysis process
is not getting worse by more moisture entering the laminate. Hatteras
is one of many well known brands with a high hydrolysis percentage.
This mostly depends upon too strong ventilation in the mould or the type
of fiber glass mats used in production, not the gelcoat. Since 1992 we have
repaired hundreds and surveyed thousands of earlier epoxy coated hulls and
in all cases the damages have been more severe than in not coated hulls.
We have performed a long time test on three pairs of similar hulls where
one in the pair has been "traditionally" dried and epoxy coated and the other
just sanded even and applied with a one component primer and antifouling.
After three years the coated ones had got severe delamination damages while the
other three still had damages in the outer layer only and no delaminations at all.
Regards Bengt

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