A friend on a boat near mine did the normal epoxy and copper powder. He is happy with it but says he needs to give it a light scrub every couple of weeks. If you did this on any painted surface you would not have any growth.

Another boat did the same epoxy and cu powder and it is now over ten years old. It is falling off in slabs.

Hoping not to come across as a fan boy for Copper Coat but I think using their resin makes a difference.

 

  Two things to clarify.

  A. Leaching copper does damage marinas.

     In some crowded marinas, filled with boats using paint with cuprous oxide, the copper level can reach points to where marine life is damaged.  This is why the U.S. and others are working to limit it.  This happens because the oxide form of copper leaches, and while this does help with antifouling, it also puts a lot of copper into the water while also reducing the useful life span of the paint.

  B.  Copper metal is non-leaching. 

    The powder, flakes, and micro-spheres used in copper/epoxy coatings like CopperCoat is non-leaching physical metal, so it does not face the same limitations as cuprous oxide.  While a leaching paint drives away growth with the copper leaching out, it's the actual copper surface with solid copper that they can't or won't stick to.  You could say this is marketing hype, but it stands to reason:  If all the copper were to leach out of the paint in 24 months, there's no way the surface would still be antifouling five or ten years later.

        - Mike

'.' eruttan@yahoo.com [harryproa] wrote on 11/13/2018 9:01 AM:

 

| The amount of copper, 2/kg per litre of resin is the maximum amount allowed by law.

https://www.yachtmollymawk.com/2012/04/search-for-effective-environmentally-safe-antifoul/3/

As pointed out in the link, I can find no source for coppercote's claim of a legal limit of copper per liter of epoxy.

Upon reflection, I think it's silly to worry about the copper when the copper is in solid water immersed BPA!

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