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Old 26 May 2009, 08:48   #1
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Country: UK - England
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Hull Cleanng and Oxalic Acid

Hi,

Where I have left the boat in the water for a few weekends the hull has discoloured a little and even turned orange in places, a freind told me to use Y10 and lent me some to use on the hull, said paint it on and wash off, Have to say it was amazing, stains literally disapeared as I watched!

I need quite a lot to do the whole hull, Do I need to pay marine prices for Y10 or would this Oxalic acid gel on ebay do the same....any experiences?

http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=330314492118

Thanks,
Andrew
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Old 26 May 2009, 09:00   #2
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I know a few people who have used common or garden oxalic acid and swear by it - don't see it will be a problem. They specifically state it can be used for cleaning gel coat - if it doesn't you should be entitled to a refund!!!
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Old 26 May 2009, 12:37   #3
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Go to the chemists and buy 500gm of powder for about 6!

Dilute with water and paint it on!

Be careful, Y10 is very weak!
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Old 28 May 2009, 14:21   #4
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Oxalic acid is the way forward.
Good rubber gloves and glasses / goggles. Anything that cleans that well is not kind to the skin.
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Old 01 June 2009, 07:47   #5
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Quote:
Originally Posted by Blizzard View Post
Oxalic acid is the way forward.
Good rubber gloves and glasses / goggles. Anything that cleans that well is not kind to the skin.
Yes, please be very careful with Oxalic Acid especially if mixing your own as this has the potential for being much stronger than proprietory solutions. It is a very dangerous poison highly corrosive. You don't want it on skin, eyes, inhaled or, of course, ingested.

Also be aware that it is toxic to aquatic organisms too. It should break down fast in a marine environment though but use sparingly!

Also, wise not to use it with the boat on your galvanised trailer - it can attack the zinc leaving white oxide deposits!
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