Galvoniv problems on saildrive of Volvo MD1120 - SailNet Community
 
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post #1 of 7 Old 05-10-2006 Thread Starter
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Galvoniv problems on saildrive of Volvo MD1120

The boat is 26 years old and every year the saildrive looks worse and worse. The previous owner always felt it necessary to paint the saildrive and the area around it with a very heavy copper paint in order to potect it. My feeling is just the opposite. The copper will attract the to softestest metal, aluminum, where as the Zinks look hardly even touched.
Not sure what to do. Spray paint the saildrive with an antifouling paint or they have this zink spray paint
Any Ideas
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post #2 of 7 Old 05-10-2006
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Generally, it is a very, very bad idea to paint any metal underwater with a copper-based anti-fouling paint. It will inevitably cause galvanic corrosion issues, and will accellerate the problems with corrosion, not protect the underlying metal.

The best paints for painting your saildrive really depend on what the saildrive is made of. If it is aluminum, which is the most typical material used, then a good two-part epoxy paint might be a good solution, followed by a tin-based anti-fouling paint. The epoxy will give it a strong, hard, base coat, to protect and seal the aluminum from further enviromental attack, while the tin-based anti-fouling, will help retard any underwater growth.

Most saildrive manufacturers will warn about using traditional copper-based anti-fouling paints on their equipment, as seen in the pdf file located http://www.practical-sailor.com/news...88Letters2.pdf .

Hope this helps.
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post #3 of 7 Old 05-11-2006 Thread Starter
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THANK YOU - Pettit makes a 2-part epoxy paint called Aluma-protect. It is made to protect aluminum hulled boats, Outboad and outdrive lower units. This sounds like what I need .
Thanks again,
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Glad to help. BTW, the previous owner sounds fairly clueless. A good tin-based anti-fouling over the Pettit might help keep the marine growth off of the saildrive.
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post #5 of 7 Old 05-11-2006
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The Usual Galvanic Problem on Saildrive

The saildrive has an aluminum hull and a steel made shaft. In this case aluminum plays the "sacrificial anode" if it gets in contact with the seawater. Good painting will do it as long as the alu is 100% sealed.

elena

Last edited by Ele5; 05-11-2006 at 03:04 PM.
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Quote:
Originally Posted by Ele5
The saildrive has an aluminum hull and a steel made shaft. In this case aluminum plays the "sacrificial anode" if it gets in contact with the seawater. Good painting will do it as long as the alu is 100% sealed.

elena
Yes, and using a Copper-based anti-fouling paint on the saildrive will greatly accellerate the galvanic corrosion problems.
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post #7 of 7 Old 05-11-2006
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I should have specified: Any "non metallous" One-Component-Paint suitable for Metal/Seawater conditions will do it.
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