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Go Back   SailNet Community > On Board > Gear & Maintenance > Using Bottom Paint on Brass Propeller
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Thread: Using Bottom Paint on Brass Propeller Reply to Thread
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Topic Review (Newest First)
04-30-2013 10:45 PM
73Morgan
Re: Using Bottom Paint on Brass Propeller

Quote:
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.
04-30-2013 06:24 PM
T37Chef
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
04-30-2013 03:49 PM
FirstCandC
Re: Using Bottom Paint on Brass Propeller

Bumping to find out the answers to what Dave asked.
04-30-2013 01:45 PM
dave6330
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
04-30-2013 12:44 PM
Fstbttms
Re: Using Bottom Paint on Brass Propeller

Quote:
Originally Posted by CalypsoP35 View Post
Am I being an idiot by continuing to use this product on my bronze prop?
Do so at your own risk.
04-30-2013 12:40 PM
CalypsoP35
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?
04-30-2013 12:19 PM
T37Chef
Re: Using Bottom Paint on Brass Propeller

Not just your prop, but the strut as well!

I use Pettit Zinc Coat on the SS Prop & Strut, even thought to use it on thru hulls?
04-30-2013 11:33 AM
MedSailor
Re: Using Bottom Paint on Brass Propeller

Quote:
Originally Posted by Maine Sail View Post
While some props are NiBrAl (nibral) most are manganese bronze. The bronze part of manganese bronze is a little misleading because most props contain upwards of 35-40% zinc.. Applying copper bottom paint can destroy them..
Ummm...... My boat yard just slathered bottom paint all over my bronze rudder hinges and my bronze prop shaft stern tube.

Is that a problem?

MedSailor
04-29-2013 05:43 PM
Tempest
Re: Using Bottom Paint on Brass Propeller

Quote:
Originally Posted by FirstCandC View Post
While we are on this similar subject- I just pressure washed a layer of bottom paint off my prop. Prop looks ok. There was also bottom paint on the stainless shaft. Do you paint this with bottom paint, use a special paint, or leave it bare??
Thanks.
I don't paint the stainless. I just clean it, touch it with an emery cloth and attach my zincs. I've resorted to starting the season with 2 zincs on the shaft and the one on the propeller. For some reason Sabres seem to eat zincs for breakfast. At first I thought it could be stray current in the water, or something in my wiring. But it seems to be a common complaint on my boat..even from owners who keep their boats on a mooring away from stray current.
04-29-2013 05:17 PM
Maine Sail
Re: Using Bottom Paint on Brass Propeller

Quote:
Originally Posted by SloopJonB View Post
Where's the tin? I thought the combination of copper and tin (along with minor other additives) was the basic definition of bronze.

Copper & zinc = brass

Copper & tin = bronze

Not so?
Michigan Wheel, the largest prop maker in the US, uses C86500 Manganese Bronze for its manganese bronze props.. It has only trace amounts of tin but about 36-42% zinc... As I eluded to in post 11 be sure you have a NiBrAl prop if you want to paint it with a copper paint. Most props on sailboats are manganese bronze. If you've got a nibral one you are lucky..

In a perfect world the shaft zinc would protect the prop but when you directly apply the paint to the prop we tend to often lose our perfect world... This is not even account for the many poorly installed zincs out there doing nothing because they are making very poor contact due to the surface of the zinc and shaft or prop not being properly prepped.
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