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From: Richard Quarles (no email)
Date: Sun Oct 01 2006 - 15:36:54 EDT
> From: "" <>
> Subject: T&T: Oxalic acid and bottom paints
> To: "trawlers-and-trawlering"
> <>
> Message-ID: <410-220069630149491 at earthlink dot net>
> Content-Type: text/plain; charset=US-ASCII
>
> Sno-Bowl, Wood deck bleach or other oxalic acid containing acid
> solution
> will erode away ablative bottom paints, at least the ones I've
> used. I've
> not found this to be true with modified epoxy bottom paints or boot
> stripe
> paints.
In the ablative paints, the Cu2O is pretty easily dissolved away.
>
> Since my boat is hauled annually for winter storage, I've been more
> or less
> forced to use ablative bottom paints. To reduce the damage from
> oxalic acid
> treatments near the waterline I made a small square sponge
> applicator which
> is screwed to a 18 or so inch long dowel stick. Using swim
> flippers, and a
> cheap life jacket, I pour some oxalic acid on the sponge to dampen it,
Interesting! Oxalic acid is a solid. Do you dissolve it in water
firswt?
> then
> run it along the waterline, just above the bottom paint, rather like
> putting paint on with a roller. One trip around the boat takes
> perhaps 5
> minutes at the most, then it's rinsed off with a hose and wash down
> pump.
>
> It is my understanding that the ICW mustache is from iron content
> in the
> water and the acid oxidizes it away.
Actually, it doesn't oxidize the iron. It's already in the 3+
oxidation state. It forms a complex ion with the iron whichis
soluble under the conditions which prevail in the oxalic acid solution.
> An application of two coats of wax on
> the V of the bow will greatly reduce the severity of the mustache.
>
> Dennis
>
> Dennis Bruckel, Cruising Editor
> Waterway Guide
> Albin 27 Sadie B
> 407 414 0531
> website debruckel.com
>
Rick Quarles
Barric II, Nordic Tug 32-147
New Bern, NC
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