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cement based coating

  1. How can I remove cement based coating?

    Concrete, Stone & Masonry
    I asked for a paint on sealant for the cinderblock on my garage. However, my contractor had a fellow trowel on a cement based coating instead. One area didn't lighten as did the rest upon drying. The area that stayed a darker gray, though rigid, is bubbled and cracked. Please, how can I get this...