[Alberg30] Re: barnacles on the prop

Brian and Elaine Timmins timmins at optonline.net
Fri Feb 14 02:35:06 PST 2003


If you use TBT, (Tin) is there a problem mixing it with a heavily laden
copper based bottom paint (from a mixed metals, galvanic corrosion, point of
view).
Brian
----- Original Message -----
From: "Robert Kirk" <isobar at cablespeed.com>
To: "Alberg 30 public list" <public-list at alberg30.org>
Sent: Thursday, February 13, 2003 11:20 PM
Subject: Re: [Alberg30] Re: barnacles on the prop


> Gordon White wrote:
> >    Of course I hear it said that putting an ounce of anti-mildew
> >additive to a gallon of bottom paint does a world of good in keeping
> >down barnacles.
>
> Yes, it does. But be sure your mildewcide is Tributyltin (TBT). The other
> housepaint mildewcide additives you can buy are more common, but
worthless.
> I was involved in some Navy research some years ago which made this pretty
> clear. It's also good in holding down the scum or grass which grows on the
> hull. Regular TBT bottom paint is forbidden for our type of boat, and
> probably will soon disappear for the larger metal hulls, too.  But a $2
> ounce of legal TBT house paint mildewcide will give better results than
the
> extra $20/gallon you'd pay for the new 'biocide' bottom paints.
>
> I bought several of these a couple of years ago at Ace Hardware, and my
> hull has been clean both years at haulout. I think the brand was "Di-All".
> Hope it's still available.
>
> Unfortunately, while it's great for the hull, I haven't found a way of
> keeping it on the prop.
>
> Bob Kirk
> Isobar #181
>
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