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Old 20-03-2014, 05:51   #1
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Pettit Barnacle Barrier compatability w/ Anodes

I was told to check the compatability of Pettit Barnacle Barrier for my prop and the aluminium anodes I use. I want to paint the prop using the Pettit, but have aluminium anodes on the prop and saildrive. Obviously, I would not paint the anodes. Is there any reason for concern that the aluminium anodes will not work because of the zinc in the paint and the bronze prop? I honestly never heard of this before..........Thanks
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Old 20-03-2014, 06:18   #2
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Re: Pettit Barnacle Barrier compatability w/ Anodes

I presume you are using aluminium anodes because you are in brackish water.

The Pettit Barnacle Barrier uses zinc. if exposed to freshwater zinc develops a layer that prevents it corroding an acting as an effective anode (hence it is not recommended for brackish water). I would expect that this would also reduce the effectiveness of the antifouling.

Most of the marine paint companies have some technical advice facility. I would certainly ask Pettit if Barnacle Barrier will work in brackish water.

I cannot see any reasons to worry about galvanic activity (but ask). The zinc and therefore the Pettit Barnacle Barrier will corrode in preference to the aluminium anode, or a the saildrive itself, which is what you want.

None of the prop based antifouling paints work fantastically well so do not expect wonderful performance even if it is deemed suitable.
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Old 20-03-2014, 10:30   #3
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Re: Pettit Barnacle Barrier compatability w/ Anodes

Thanks for the reply. Yes, I am in brackish water. The only thing that seems to work well is Prop Speed, but at a very high price. I have also read that some boaters are using Rustoleum Galvanic Rust Inhibitor which contains the same amount of "Zinc", 92% as the Pettit. I can also polish the prop as I do every year and not put anything on it.
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