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Brightening aluminum boats after manufacture

My company manufactures small aluminium boats. I would like to clean and brighten the aluminium after manufacture to give a uniform bright silver color to the boat. To do this I need a chemical that can be washed on and hosed off, removing various manufacturing stains such as grease, water marks, weld smoke etc. At the moment I use a lime wash but the result is an etch leaving the boat a uniform grey, not a uniform silver.

Ray Nicholls
metal fabrication - Suva, Fiji Islands
2004

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