Acid stain on coloured pressed concrete patio

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30 Jul 2013
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Essex
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United Kingdom
An oven cleaning chemical, Oven Pride was accidentally spilled on my coloured pressed concrete patio and has bleached it's colour. I would appreciate any advice on how to repair the damage.
 
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You will need to get some Nitromors to strip off the old sealer in the damaged area & a little extra all round, then wash thoroughly & rinse with plenty of water, if you have an ashlar pattern then you should be able to do it easily enough. Then get some Cementone mortar dye the same colour as your concrete & try to mix it as closely as possible to the colour you have but bare in mind that when you reseal it it will go slightly darker. Allow it to dry off for a couple of days & once you are happy with the result apply a priming coat 50% sealer/50% thinners, then apply a top coat of pure sealer. It will probably be a lot easier & cheaper to get a professional in though as the materials are all very expensive & not available in small quantities.
 
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Thank you
all for your advice. I have now realised that they are flags. Have tried a proprietary patio cleaner with limited success. And will continue. Failing that I will turn them over. It is great to have advice from people who know what they are talking about. Thanks.
 

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