Because fibreglass sailboats stay afloat for long periods, osmosis is a common hull problem. Caught early it's manageable; neglected, the whole hull needs work.
Why common on sailboats?
On sailboats kept constantly afloat and not always hauled out in winter, laminate moisture rises. This sets the stage for osmosis.
Symptoms and diagnosis
Underwater blisters, a sour smell and a high moisture reading point to osmosis (see osmosis symptoms). The blister vs osmosis distinction matters.
Treatment
Treated with gelcoat peeling, full drying, epoxy barrier and antifouling. Skip drying and the problem returns. For prevention, see preventive care.
We do your sailboat's hull/osmosis work under our fibreglass repair service and sailboat care. Get a free survey with a moisture reading.
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