Posted by Bengt Blomberg on May 06, 2001 at 14:14:30:
The difference mainly depends upon the amount and individual
weght of the woven roving layers involved.
Further the hydrolysis and delamination disposition between
the roving layers increase because the labour forces used
for the large hulls are heavily regulated by their unions regarding
working hours. Very often, especially in warm climates, one layer
is allowed to cure too much before the next layer is applied.
The small hulls are mostly constructed with chopped mats only or by
spray technique. This laminate seldom becomes affected if not
construction faults like moist mats or reaccelerated resin are used.
Applying the first sprayed layer too early to the gelcoat caused fiber
ends to penetrate into the gelcoat where it can hit a "trigger" enclosure
and start a hydrolysis in the gelcoat. This can then spread a little
inwards. Here most conventional repair methods will be sufficient.
Some small and middle sized hulls have a thin woven mat as second or
third layer. Such constructions we have found are very apt to hydrolyse
under that mat. Also here most conventional methods will succed if the
woven matt and the layers above are peeled off before drying and coating.
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