Osmosis in Fibreglass Yachts: What Hull Blisters Can Tell You

Osmosis is one possible cause of blisters on a fibreglass hull. A blister is a reason to investigate the coating and laminate, not proof that the hull is structurally unsound.

During the haul-out

Photograph the underwater surface and note the size and distribution of blisters before the hull dries. Ask the surveyor to distinguish paint or coating defects from problems deeper in the laminate and to interpret moisture measurements in context.

Before agreeing a repair

Ask the yard which layers must be removed, how drying will be assessed, what coating system is proposed and which costs depend on findings after stripping. A protective coating over an unprepared or wet substrate may not solve the underlying problem. See an anti-osmosis hull preparation case with photographs.

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