Using Bottom Paint on Brass Propeller - Page 4 - SailNet Community
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post #31 of 36 Old 04-30-2013
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Re: Using Bottom Paint on Brass Propeller

I've been using Trilux prop and drive spray, with limited success. By the end of the season it is pretty much all worn off. But now that I look at the label, it says for "aluminum" props. "Copper as metalic 4.48%."

Am I being an idiot by continuing to use this product on my bronze prop?

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post #32 of 36 Old 04-30-2013
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Re: Using Bottom Paint on Brass Propeller

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Am I being an idiot by continuing to use this product on my bronze prop?
Do so at your own risk.
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post #33 of 36 Old 04-30-2013
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Re: Using Bottom Paint on Brass Propeller

OK - Galvonic corrosion...so I'm a little slow on the uptake....let me get this stright...

1. No paint on the exposed SS prop shaft (just clean it and install a new zinc).

2. Special zinc based paint for the bronze prop? Is this really better than simply cleaning the bronze prop and leaving it bare?

3. And bronze thruhulls - do they need special paint too??? I'm a little cornfused.

Currently "Between Boats" but wanting to stay current (no pun intended).

Dave

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post #34 of 36 Old 04-30-2013
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Re: Using Bottom Paint on Brass Propeller

Bumping to find out the answers to what Dave asked.

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post #35 of 36 Old 04-30-2013
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Re: Using Bottom Paint on Brass Propeller

Zinc Coat Barnacle Barrier

"Zinc Coat Barnacle Barrier 1792 provides easy to use aerosol spray protection for bare metals including steel, stainless steel, cast iron, copper, bronze, galvanized steel, and lead. It forms an excellent bond to underwater metals and running gear, and inhibits corrosion on these surfaces. Zinc Coat Barnacle Barrier’s smooth, hard surface will self-clean in service, and can be used above or below the waterline. The dried film of Zinc Coat contains 93% pure zinc."

I have been using the above on my prop (SS), shaft (SS), and strut (bronze) for several years now with very good results except one season when the water temp were well above the average plus we didnt use the boat much during the month of August. The above is self cleaning when the boat is in service, I doubt anything will work well if you dont use the boat often, often meaning at least once a week.

I have used vaseline on my spped paddle wheel with great result, using a Q tip to apply. Some have mentioned using a sharpie also works well? Dunno

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Last edited by T37Chef; 04-30-2013 at 05:29 PM.
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post #36 of 36 Old 04-30-2013 Thread Starter
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Re: Using Bottom Paint on Brass Propeller

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Originally Posted by dave6330 View Post
OK - Galvonic corrosion...so I'm a little slow on the uptake....let me get this stright...

1. No paint on the exposed SS prop shaft (just clean it and install a new zinc).

2. Special zinc based paint for the bronze prop? Is this really better than simply cleaning the bronze prop and leaving it bare?

3. And bronze thruhulls - do they need special paint too??? I'm a little cornfused.

Currently "Between Boats" but wanting to stay current (no pun intended).

Dave
Item 1&2, that is the consensus.
Item 3, bronze through halls, you need to strip all paint off the through hall and the area 6 to 12 inches around it, paint that with epoxy paint. The epoxy isolates the area around from electrolysis between the bronze and bottom paint. Then bottom paint over the epoxy.
This has worked well for me, hope to see how other people handle that.

Last edited by 73Morgan; 04-30-2013 at 10:10 PM.
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