Using Bottom Paint on Brass Propeller - SailNet Community

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Old 04-23-2013
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Using Bottom Paint on Brass Propeller

Just polished up my brass propeller after 15 years of using ablative bottom paint on it. It polished up real nice, no corrosion damage. I was told I should use some fancy stuff ranging in price. It seemed like a lot of money, I had to understand what it was going to do for me. Found an old post on here which had some good alternatives (link below). Not giving up yet, I looked up galvanic reaction of various metals (second link below). A difference of hundreds of mill volts is likely to result in galvanic corrosion, but only a few tens of mill volts is unlikely to be a problem. Note that the numbers at the top are in Volts. The chart shows copper and brass in the same range. Plumbers have been mixing brass and copper for over 100 years with no problems. The paint I've been using is the cheapest I can find, it has Copper and Cuprous Oxide (principal oxides of copper), which I believe to be very common ingredients for bottom paint. I am not a scientist but it seems that this is just a bunch of nonsense with the brass props.

Interested in knowing what you guys think, or maybe shed some more light on the subject.

Brass Prop Anti-Fouling Coatings ?

Galvanic Corrosion Chart*

Last edited by 73Morgan; 04-23-2013 at 11:18 AM.
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Old 04-23-2013
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Re: Using Bottom Paint on Brass Propeller

The prop will be bronze, not brass....
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Old 04-23-2013
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Re: Using Bottom Paint on Brass Propeller

If its brass its too late.
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Old 04-23-2013
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Re: Using Bottom Paint on Brass Propeller

Slightly off topic, but my friends were stuck in one spot at anchor for 3 months with a dead engine. She put pieces of nylon stockings on the blades to protect them. After all that time, the nylon slid right off covered in barnacles and slime and cleaning the prop was a 30 second job.
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Re: Using Bottom Paint on Brass Propeller

Quote:
Originally Posted by Faster View Post
The prop will be bronze, not brass....
Color is brassy, I thought bronze has a bronze hue. Are all props bronze?
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Re: Using Bottom Paint on Brass Propeller

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Originally Posted by SimonV View Post
If its brass its too late.
Why is it to late?
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Re: Using Bottom Paint on Brass Propeller

Quote:
Originally Posted by 73Morgan View Post
Color is brassy, I thought bronze has a bronze hue. Are all props bronze?

Not all props are bronze, but I'm pretty sure there are no brass props.

SS, Aluminum, Plastic etc... but not brass.
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Re: Using Bottom Paint on Brass Propeller

Quote:
Originally Posted by sww914 View Post
Slightly off topic, but my friends were stuck in one spot at anchor for 3 months with a dead engine. She put pieces of nylon stockings on the blades to protect them. After all that time, the nylon slid right off covered in barnacles and slime and cleaning the prop was a 30 second job.
Clever idea.
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Re: Using Bottom Paint on Brass Propeller

Faster, Thanks

I appreciate the correction it's a bronze prop. If I am reading the chart correctly copper is on the Anodic side of the two bronzes shown. Copper would then be the sacrificial metal to the bronze. So, it still makes sense to me that there is no problem with using bottom paint with copper in it on bronze props.
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Re: Using Bottom Paint on Brass Propeller

WELL

There is bottom paint that is made for underwater metal


Not everything happens to things 100% of the time they are just general recommendations of what is considered good and bad practice

I can snap a picture next time I am inside a SS vessel from the 1970s were the SS blade locking pins got in a fight with the blade they were locking and as a result the pins SS pins LOST

I can go in its twin same age same place nothing happened
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If a dirty bottom slows you down what do you think it does to your boat
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