Boatbuilding Blog

September 16, 2007

Don’t Use Copper Powder in your Epoxy

Filed under: Building - Painting — tomlarkin @ 10:51 am

I was going to mix copper flakes into my underwater epoxy as a built-in anti-fouling paint. Sam mentions it in his book. I asked him about it:

—–Original Message—–
From: Tom Larkin
Sent: Monday, June 25, 2007 6:01 PM
Subject: Copper bottom paint

Hi Joel,

Sam’s book talks about coating the bottom with copper powder mixed into epoxy to keep from having to bottom paint every year. Do you carry anything like that?  If not, do you know of a supplier for that kind of coating? There’s a supplier for copper flakes ( for a do-it-yourself solution. Would you recommend that?


      — Tom Larkin


Sam’s answer:

From: Joel Mill
Sent: Thursday, July 05, 2007 7:17 AM
To: Tom Larkin
Subject: RE: Copper bottom paint

Tom:  After trying that product out for several boats and seeing thru the years how it performed I regret putting it in the book.  It still required annual haulouts and exasperating hand sanding to renew the copper exposure to the exterior and the anti-fouling qualities weren’t really very good.  Best thing is use an ablative bottom paint like Micron CSC by International and just roll a new coat on every year.  Regards Sam

So, I’m going to use Interlux 404/414 primer and Interlux Micron CSC bottom paint. I’m going to try to stick to a single paint supplier on the theory that the paints will be formulated to work together.  I’ll probably use Interlux Brightsides for the topsides (if they make it in black).


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