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  • Black concrete powders

    I poured a concrete drive, dusted and floated in black Colorundum, and sprayed with "60 D" curing compound. There were about five pours involved to complete the driveway. Some pours were rained on during the night after the pouring. In varying degrees, white powdery material formed on the black...

     

  • Floor in damp basement

    I have a particular problem with a damp basement in a new home. The floor seems to change color and darken in the center of the room and toward the walls.