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What is Osmosis and How to Deal With It

Osmosis is a degenerative process that occurs inside the fiberglass laminates when water has penetrated thought the gelcoat to the polyester compound. Gelcoat despite it’s excellent properties is not 100% waterproof nor is destined to be waterproof though the life of a boat. Gelcoat loses its impermeability over the years (knocks, natural wear & tear, pores, cracks) and allows water to seep into it progressively.
Once the gelcoat layer has been breached by the sea, the underlying polyester will react chemically with the sea water and decompose by producing acetic acid. Since acetic acid cannot escape back into the water …