Mapei Ultracolor Plus grout for Outdoor Porcelain Paving

Discussion in 'Tiling' started by swaring, 2 Aug 2020.

  1. swaring

    swaring

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    I wonder if anyone could advise on the below please.
    I purchased the Mapei Ultracolor Manhattan Grey grout after reading all the good reviews on the screwfix website. I bought 3 x 5kg bags of the Mapei Ultracolor for my outdoor porcelain paving.

    I mixed the product exactly as specified and with a paddle mixer. Followed the instructions EXACTLY. Mixed let it set for 3 minutes, mixed again to a nice paste. It was mixed thoroughly, no powder was left behind

    A week after applying I am getting what looks like dark staining all over the grout lines.

    Initially it looked great but a week on it looks terrible.

    Can anyone advise on this at all?
    I have attached images of the finished look.
     

    Attached Files:

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  3. swaring

    swaring

    Joined:
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    Location:
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    Has anyone got any advice on this at all?
     
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