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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 12-03-2006
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G. is your column aluminum?
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  #12  
Old 12-04-2006
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I thought I've read somewhere not to paint the Saildrive, which is aluminum, with bottom paint that contains copper.

At least one reference would be to goto www.yachtpaint.com and follow the links a product data sheet of a bottom paint that contains copper. Under "Compatibility/Substrates" for the paint I use I found "Do not use ... over aluminum."

Last edited by TejasSailer; 12-04-2006 at 05:59 AM.
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Old 12-04-2006
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Giulietta,
Not knowing what saildrive you have makes it difficult, but I didn't see that this stuff works on aluminum, and if you have been painting a saildrive with regular bottom paint, that is BAD for aluminum. I used to take my OMC down to bare metal, prime it with outboard primer, paint it with outboard paint, then apply outboard anti-fouling. worked pretty well, and no pitting of the outdrive. Good luck,
Bill
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Old 12-04-2006
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Whenever applying anti-fouling paint to underwater aluminum, an isolating primer is required between the metal and first coat of bottom paint. I have used Interlux Tri-Lux underwater primer on the outdrives of my powerboats - otherwise, as was mentioned above, the aluminum will corrode through a galvanic reaction with the paint's copper content.

The bronze strut and rudder post base on my Nauticat are properly primed before coating, but the prop and shaft are always left bare. I do haul out prior to winter storage and use a wire wheel attachment on a drill to clean the prop & shaft metals to a bright finish before launching. During season, I regularly dive under the boat to brush and scrape all emergent growth off the bare metal - before it gets out of control.



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Last edited by TrueBlue; 12-04-2006 at 08:24 AM.
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Old 12-04-2006
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I believe there are tin-based anti-fouling paints that are safe for use on Aluminum saildrives, but I haven't used them.
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Old 12-04-2006
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Tin based anti-fouling is outlawed in this country due to the enviromental damage it causes...still used by big ships though! Makes sense to me!!
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Old 12-04-2006
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Antifouling for Saildrive

I have a Volvo saildrive. I was told by the dealer and several maintenance people not to use a copper based antifouling paint on the aluminum saildrive. Do not use regular bottom antifouling. At launching in 2004, the worker applying the paint used a tin based product on my saildrive. This worked very well. As previously stated, tin based products are illegal, so I obviously had to use something else at haulout last year. First I had to prime the drive with an "undercoat" to avoid incompatibilities, and then I used a Trilux paint designed for underwater metals (aluminum in particular). In my case, I used an aerosol spray paint. One can was plenty for several coats. I also painted my aluminum prop with the same paint.

Be very careful with this, as you could create a very expensive problem for yourself if you inadvertently cause corrosion on your aluminum saildrive by using a non compatible paint.

Hope this helps,
Tom
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Old 12-04-2006
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Guys,

Thank you for your responses. I was taliking to the guy that painetd my bottom, before she went in the water, and he did not use the same paint used on the hull.

Apparentely he used a spray can with special antifouling ingredients, specifically for painting saildrives. That is why the bottom paint stays and the saildrive washes. You just have to keep adding more.

Duhhh!! (as my kid says!!!!)

Thank you very much.
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