Monthly Archives: F Y


Osmosis is a process where water gets into air voids in the fibre glass laminate and reacts with residues from the resins. The reaction creates a pressure in the voids and the visible blisters appear on the underwater hull. A smelly acidly liquid runs out when the blisters are opened up.
A osmosis test, carried out by a qualified marine surveyor, consists of measuring the moisture content for the fibre glass laminate.
At a certain level of moisture in the laminate, it has to be assumed that the strength of the hull is reduced and an osmosis treatment should be carried out.