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Subject: TWL: Home made "On & Off"
From: Rick Quarles (rquarles@XXX.XXX)
Date: Sat Nov 02 2002 - 07:50:27 EST
>
>
>I'm thinking about trying to make a low cost replacement for On & Off.
>Norm uses a 50/50 mixture of water and muriatic 41%acid. I'm thinking
>about adding a bit of oxalic acid, TSP, and detergent to Norm's brew.
>Are there any chemists on the list who might see a problem
>(interactions) with this brew?
>
All that's needed to remove the 'waterway moustache' is the oxalic acid.
My observation on my own boat, where I get it mostly on the swim
platform, is that it is probably iron oxides, since "Clorox" doesn't
faze it but the oxalic acid takes it right off. The oxalic acid is a
fairly weak organic acid and shouldn't hurt anything else, such as
gel-coat. It forms a strong complex with the iron and off it comes.
Buy it at any paint store as wood bleach-- $4-5/ pound. I usuallu just
sprinkle some on a wet brush, brush the stain and rinse off.
Rick Quarles
Barric II, Nordic Tug 32-147
New Bern, NC
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