barnacles on prop, shaft - SailNet Community
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post #1 of 54 Old 11-16-2009 Thread Starter
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barnacles on prop, shaft

I neglected to protect the prop shaft with antifouling paint and now that the boat is on the hard, I see it is covered with barnacle skeletons.

I have knocked off as much as I can, but would like some advice on the best way to rid the shaft of what is left.

On/Off? Is it safe to use on bronze? How badly does it attack the cutlass bearing if I get a few drops in it?

Sandpaper?

thanks,
pegasus

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post #2 of 54 Old 11-16-2009
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Scrape them off. Don't use ON&OFF as its a strong acid.
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post #3 of 54 Old 11-16-2009
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Scrape and then buff with a wire wheel or one of those 3M wheels.

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Toronto in summer, Bahamas in winter.

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post #4 of 54 Old 11-16-2009
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Be careful. You don't want to have to get your prop balanced.
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post #5 of 54 Old 11-16-2009
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Why NOT to paint your prop with bottom paint

Our friend Maine Sail says it better than I can:
Why Not To Paint Your Prop (with copper based paint) - SailboatOwners.com
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post #6 of 54 Old 11-16-2009
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I never see painted shafts, so I don't think you forgot to do anything. You should also have zinc collars on your shaft. Yeah - I get barnacles on my shaft also, I knock the big parts off with something hard like a scraper, and finish with scotch bright or a wire brush. They come off easier if you get them when they are wet, and don't let them dry out.

I've used Petttit Prop-Koat on my propeller with some success, but its very expensive and application is a two step process (primer and clear coat finish). I might be tempted to try it on my shaft but I would be careful to avoid coating where the zincs were going, you want a good electrical contact between the zinc and the shaft.

Last edited by TaylorC; 11-17-2009 at 07:34 PM.
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post #7 of 54 Old 11-16-2009
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I must be missing something here. My aluminum rudder shaft was badly damaged by copper bottom paint. I know it because the only place eaten away is right at the bottom paint line, nothing above or below. However I fail to see how copper bottom paint could damage a copper alloy! I'd have to believe it was electrolytic action from stray currents, and no zincs.

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post #8 of 54 Old 11-17-2009
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May I ask why it makes a difference to not paint your prop; while most people paint their thru-hull, stanchion and skeg? These items had 30 years of paint on them on my boat; and none had the de-zincification that was shown in the pictures of the props over on that thread.

I don't discount the possibility that the paint causes galvanic corrosion; but I am wondering why it would be different for a prop than a thru-hull.
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post #9 of 54 Old 11-17-2009
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After you get it clean, try protecting it with Zinc spray by Pettit. I have used it for years with much success.

See here: http://www.pettitpaint.com/fileshare...ds/1179320.pdf



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Last edited by T37Chef; 11-17-2009 at 01:27 PM.
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post #10 of 54 Old 11-17-2009 Thread Starter
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Quote:
Originally Posted by TaylorC View Post
I never see painted shafts, so I don't think you forgot to do anything. You should also have zinc collars on your shaft.

I've used Petttit Prop-Koat on my propeller with some success, but its very expensive and application is a two step process (primer and clear coat finish). I might be tempted to try it on my shaft but I would be careful to avoid coating where the zincs were going, you want a good electrical contact between the zinc and the shaft.
I am not that ignorant I have zincs on my shaft and I wouldn't dream of putting anything between them and the shaft.

Someone in my boatyard said that he had sprayed his shaft with a product from WM [I do not recall the name] and it kept the marine growth off his shaft and prop. I will have to ask him what he used.

"Expensive" is a polite way of characterizing the Pettit-Koat. But I guess for $175 you get 10 yrs use out of a quart.

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Last edited by pegasus1457; 11-17-2009 at 12:16 PM.
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