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Coppercoat and Osmosis

Long-Term Coppercoat Application & Osmosis Treatment

COPPERCOAT  As an alternative to a normal antifoul application, Mylor Yacht Harbour’s Marine Team can also offer the application of the longer lasting Coppercoat system.  A combination of a special water based epoxy resin and ultrafine copper, Coppercoat is an extremely effective and strong antifoul.  Available in one full strength hard wearing version, the non eroding epoxy is kinder to the environment than its self eroding competitors and can deter growth for ten years or more.  

OSMOSIS TREATMENT  Osmosis is the term used to describe the blistering that can be found on some GRP boat hulls.  This blistering is caused by water molecules diffusing through the gel coat and laminate and then condensing in small voids, air pockets and microcracks within the resin used to create the laminate.  The resulting solution created becomes water absorbing and as the process continues, the pressure becomes too high for the surrounding material and a blister forms.

That’s the bad news.  The good news is that Mylor Yacht Harbour’s GRP Specialists can treat the blisters caused by osmosis.  As part of the overall treatment process, we use the HOTVAC system of heated pads on the hull to remove moisture and cure uncured resins before replacing the old gel coat with epoxy resin, forming an almost impermeable barrier.

Contact us for more information on coppercoat or osmosis treatment

Long-Term Coppercoat Application & Osmosis Treatment Near Falmouth, Cornwall


Maintaining a sound underwater hull is essential for vessel performance, fuel efficiency, and long-term structural integrity. The Coppercoat and Osmosis treatment center at Mylor Yacht Harbour provides specialist hull protection, long-term multi-season antifouling, and comprehensive gelcoat blister remediation for boat owners throughout Falmouth and the Fal Estuary.

As an approved application center, our skilled technicians specialize in Coppercoat multi-season antifouling, a hard-wearing epoxy resin system embedded with recycled copper. Applied correctly under controlled humidity and temperature conditions, a single application provides proven antifouling protection for up to ten years or more, eliminating the need for annual scraping, priming, and seasonal antifoul painting.

For GRP hulls affected by gelcoat blistering or water absorption, our team provides complete osmosis diagnosis and remediation. Using precision moisture meters, hot water pressure washing, gelcoat peeling equipment, and controlled drying environments in our marine workshops, we strip away damaged laminates and dry the hull thoroughly. Once moisture readings reach optimal levels, we apply solvent-free epoxy barrier systems, rebuilding the underwater hull to restore original strength and prevent future moisture ingress.

Supported by our on-site 38-tonne travel hoist and indoor yard space, our hull specialists oversee every stage of the preparation and curing process with strict quality control. Whether you want to eliminate yearly antifouling chores with a durable Coppercoat coating or require expert osmosis treatment to protect your boat’s value, Mylor Yacht Harbour offers long-lasting underwater hull solutions.

Protect your investment with advanced marine hull coatings. Contact the Mylor Yacht Harbour marine services team today to schedule a hull moisture inspection, request a Coppercoat estimate, or discuss your vessel’s maintenance requirements in Falmouth.
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