Home made copper antifoul

Tips and pointers to keep the critters away
Whimsical
Posts: 370
Joined: Sat Apr 28, 2007 8:01 pm
Location: Fremantle W.A.

Home made copper antifoul

Post by Whimsical »

I mixed copper powder with epoxy at a ratio of 2 parts copper to one epoxy.

When applying it it is very sticky and doesn't want to roll out. It will eventually spread with a lot of pressure applied to the roller and a lot of back and forth. I am thinking of using a thinner in it on the next hull.

Has anyone done the same before, what do people recomend.



Mike
44c
Posts: 1148
Joined: Tue Aug 08, 2006 5:08 am
Location: Hervey Bay, Qld

Home made copper antifoul

Post by 44c »

Add more epoxy? It's not a real antifoul anyway, Mike, in that it won't ablate. It's really just a very tough backup paint.
madaz
Posts: 527
Joined: Thu Apr 26, 2007 7:47 am
Location: Hobart, Tasmania

Home made copper antifoul

Post by madaz »

I used the Copper Coat DVD as a guide, they use 2kg of copper powder to 1 litre of resin, which is not the same as 2;1 by volume...



I rolled mine on with a foam roller and wound up with a nice smooth finish.



I didnt realise it had to ablate to be a "real" antifoul. Copper Coat is supposed to last 10 years plus and doesnt ablate, trouble is its pretty dear.



A good source of fine copper powder is http://www.barnes.com.au good price by the 5 kg or 10 kg lot.



tony
Whimsical
Posts: 370
Joined: Sat Apr 28, 2007 8:01 pm
Location: Fremantle W.A.

Home made copper antifoul

Post by Whimsical »

I used 2:1 by weight with west resin

Maybe the foam roller spreads it better than the short nap.

More epoxy will just reduce the amount of active copper exposed so lessen the efectiveness.

I am thinking of using an ablative over it then the copper just becomes a backup especially in areas where the ablative wears away faster such as rudder and dagger leading edges.



Mike
Smooth Cruiser
Posts: 583
Joined: Thu May 11, 2006 1:51 am
Location: Brisbane

Home made copper antifoul

Post by Smooth Cruiser »

Whimsical wrote:I am thinking of using an ablative over it then the copper just becomes a backup especially in areas where the ablative wears away faster such as rudder and dagger leading edges.

Mike


It doesn't need to be ablative to be an antifoul - you get hard antifouls or ablative antifouls.



Why would you use an ablative over the copper? You don't really need a backup in place - once the antifoul stops working you still have around 6 months from experience before the weed gets too thick. I would just go with the copper. Part of the advantage in my understanding was the smoother surface the copper gives (extra speed) as well as the longevity. I may have this wrong though.



I have found that the places that lose the antifoul first is around the water line - leading edges and things aren't really a concern. Maybe I don't go fast enough. :oops: For me I have to redo the antifoul when the waterline starts wearing thin, but at that time the lower parts of the hull still have good protection - even leading edges and rudders. (And yes - to combat this I did an extra coat around the water line this time when I re-did the antifoul!)
44c
Posts: 1148
Joined: Tue Aug 08, 2006 5:08 am
Location: Hervey Bay, Qld

Home made copper antifoul

Post by 44c »

Sorry but it does need to ablate in order to keep working. You need to keep exposing fresh biotoxins - ie copper. The "hard" antifouls do ablate - they just do it slower - and they are often less effective than 'soft" because of this.



The copper-epoxy antifouls are formulated to keep exposing new copper. (Which is why the stuff costs so much more than just copper powder mixed with epoxy) Our home-made stuff doesn't do that, and if you launch without putting "proper" antifoul over it you will soon have a ton of growth.



Bob has been painting the bottoms of his boats with epoxy mixed with copper for many years, and you still have to use a "proper" antifoul over the top of it. It's not the same as the copper-epoxy antifouls you can buy.
terryk
Posts: 320
Joined: Wed Jan 10, 2007 10:37 pm
Location: Gosford

Home made copper antifoul

Post by terryk »

Hi builders, check out this guys website he has done a bit of copper epoxy antifoul research, also his building site has some good info.

http://members.shaw.ca/ArcticTern3/Vol03Iss07.htm

Cheers

terryk
44c
Posts: 1148
Joined: Tue Aug 08, 2006 5:08 am
Location: Hervey Bay, Qld

Home made copper antifoul

Post by 44c »

He did pretty much the same as me - added copper until it seemed about as thick as i could reasonably roll on. I used 15kg of copper powder.



He has used about 2.5 kg.... I dont expect mine to work as a permanent antifoul - I dont think his will either.
Whimsical
Posts: 370
Joined: Sat Apr 28, 2007 8:01 pm
Location: Fremantle W.A.

Home made copper antifoul

Post by Whimsical »

I was talking with Rob Denney yesterday, he came for the hull rolling ceremony. He had a boat with the copper bum and found that while it is not a really good antifoul it is very easy to scrape any growth off. This is what I had heard before and was behind my plan to use it as a base for an ablative. Where the ablative wears off the copper should make an easy cleanup and negate the need for urgent action.



Mike
Crasara Cruzin

Home made copper antifoul

Post by Crasara Cruzin »

Hi Guy's,

Is it possible to use a squeggy with this Copper epoxy mix after it has been rolled on to smooth it out?? Our Jotun seems to last around 2 years is thias the norm or is it because we are always moving?
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