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Old 03-26-2012
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Prop...painting it

Hello
This past season, the new Marina I live at caused EVERYTHING not coated in bottom paint to become covered with barnacles.

I have seen people paint their Brass props with bottom paint. While I never thought of doing that, as I never felt the urge to look up how does brass and copper (in the paint) co habitat.... Now I find myself looking up that info.

I vaguely remember something in chemistry about that.

So, the real question is...has anyone done this (as far as the chemistry brass vs copper it is all cool) but should I do this? Does it pit the prop?

The 2 hours of scraping barnacles and sanding is not something I wish to do again...or atleast at this level of effort.
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Old 03-26-2012
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Re: Prop...painting it

Look at the beautiful photo of my prop painted with zinc paint...

SailNet Community - jameswilson29's Album: Winter repairs: replace propeller - Picture

...done after posting a similar post to yours.
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Old 03-26-2012
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Re: Prop...painting it

I doubt anything the marina did caused this increased growth. Probably warmer water temps to blame. Either way, you are better off not painting and just cleaning the prop periodically. You can paint it but the AF paint must be isolated from the bronze.
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Old 03-26-2012
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Re: Prop...painting it

Props aren't brass, they're bronze. And as I understand it, yes there is an interaction between the copper and the bronze, which will weaken the bronze. I think you'd be OK if you paint the prop first with an epoxy barrier coat and then bottom paint. BTW, I just spray my prop with zinc transducer paint and this seems to fight off the barnacles.
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Old 03-26-2012
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Re: Prop...painting it

There was another thread about this not too long ago and a lot of folks recommended a prop and drive paint, I think it was a Petit product. I've used Trilux prop and drive spray paint over a zinc chromate primer for several years now and it has worked very well, no barnacles.
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Old 03-26-2012
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Re: Prop...painting it

Using Pettit Zinc Coat Barnicle Barrier #1792 on Bronze prop for 1st time this year.
Made for use on metal/bronze.
Have heard good things from multiple sources including other sailnet threads.
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Old 03-26-2012
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Re: Prop...painting it

Oh yea...forgot...product is grey. Took some maning up to spray my beautiful
flex o fold prop gray...but then I remembered what it looked like coming out
of the water last fall.
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Old 03-26-2012
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Re: Prop...painting it

When it comes to running gear, Prop Speed is probably the best you can buy, but expensive and very labor intensive to use.
Pettit Zinc Coat is cheap and easy to use and does a very good job. Hard to beat.
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Old 03-26-2012
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Re: Prop...painting it

Petit Zinc Coat Barnacle Barrier .... Great stuff and relatively inexpensive.

No need to 'isolate' from the bronze with any intermediate coating.

Its primarily a zinc rich coating and if any 'seed' barncales do attach they are 'stunted' from growing and their 'adhesion' is very limited ... and can be 'wiped off'.

I sail many thousands of miles per year ... the barnacle barrier holds up quite well.

I keep my boat in the upper Chesapeake where barnacle growth, in the increasingly warm & increasingly very turbid water, has gone 'exponential' in slime and barnacles in the past few years. Many bottom paints are no longer useful there vs. 'hard growth' ... but the Barnacle Barrier 'really' works very well on the prop.

Last edited by RichH; 03-26-2012 at 02:08 PM.
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Old 03-26-2012
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Re: Prop...painting it

I've been using a hard bottom paint on the prop for the past 10 years with good results however you first need to prep the prop first with an underwater metal primer. I've been using Petit products and two thin coats of bottom paint.(Bluewater paint with high Cu content)
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