Coppercoat Antifouling

The brand that rings & reverberates with sailors across the world. – The First & Only Choice – as these peculiar group of people would vouch for.

Since taking over the Coppercoat Distributorship in 2017, it has been a very interesting time of meeting a group of owners, usually sailboats, lagoon owners, or smaller motorboats, who are just determined to get hold of this mean antifouling defence tool, for their underwater hulls.

Coppercoat proudly declares that their antifouling has a life span of 10 years and some still counting, a result that no other yacht antifoul brand dare to even touch / go near or hint at.

Being paint manufacturer’s of the OceanMaster marine coatings ourselves, we take a look at this unique water based epoxy copper coating.

What is Coppercoat?

Coppercoat is the combination of a specially developed two-pack epoxy resin and 99% pure copper. Each litre of Coppercoat contains 2kg of ultra fine copper powder, the maximum allowed by law. On immersion, sea water attacks the exposed pure copper, causing the formation of cuprous oxide. This highly effective anti-fouling agent deters growth until the surface degrades further to become cupric hydrochloride. This final copper form is highly unstable, and is washed away by the movement of the yacht, thereby removing any accumulating silt or slime. This automatically reveals a fresh copper-rich surface whereby the process recommences.

Where can Coppercoat be applied?

Yes. Coppercoat can be successfully applied to virtually all craft, irrespective of their size and usage, hence is sold to both the commercial and leisure sectors. Coppercoat is also supplied to underwater structures such as tide-powered turbines and effluent diffusers as well as bar screens in power stations.

Does  Coppercoat protect against Osmosis?

The inherent waterproofing qualities of the epoxy ensure that a treatment of Coppercoat will help prevent osmosis in GRP craft and offer extra protection against corrosion in steel vessels. However for an even greater degree of protection, additional anti-osmosis epoxy can be applied as an undercoat.

Here at Oceanic Link, we highly recommend the following system

GRP/ Fibreglass / Wooden substrate –  3 Coats of West System Solventless Epoxy , tack on tack, thereafter 04 thin coats of Coppercoat.

Because of the hot & humid tropical weather that we face here around South East Asia, we need a fresh water wipe down on the final coat, when it is fully cured. Amine Blush is a almost soapy like occurrence with cured epoxy and this prevents a good adhesion of Coppercoat

Aluminium / Steel substrate – 2 coats of OceanMaster Universal Primer, 2 Coats of OceanMaster Everguard Epoxy – followed the by 04 thin coats of Coppercoat. Because the OceanMaster is a solvent primer & undercoat system, you will need for the solvent to fully evaporate prior to rolling on the Coppercoat. It would take about 1-2 days in the tropics. OceanMaster presents an economical value for money system for many boats hulls here.

Does Coppercoat cause any problems with regards to Galvanic / Electrolytic action?

No. With the resin carrier insulating each copper particle, the final coating is inert and non-conductive. A current can not pass through Coppercoat and this coating does not cause or promote electrolysis or cathodic decay. Consequently Coppercoat can be safely applied to metal structures such as iron keels and steel or aluminium craft (after the application of an appropriate epoxy primer). The property of electrical non-conduction in metallic powders including copper was first discovered in 1890 by Eduard Branley and is known as the “Branley Effect”. Sacrificial anodes should be fitted in the usual manner.

Final Verdict Reports

For the past 2.5 years since taking over the distributorship of Coppercoat, we have had consistent results with the paint system for the many boats that we have seen rolled / sprayed with the material. Yes, as with all antifouling around the world, things will still grow unto the underside of the hull if the boat is stationary for long periods of time. However, Coppercoat has proven that it is a reliable antifouling and we are continuing to receive good reports on the product’s life span. Yes the brownish almost bronze like colour tone may not be the most attractive colour to be painted to match the whites of the yachts, but it still does the job! You can never have the best of both worlds.