Sand and cement screeds and concrete can be highly porous and absorb moisture from subsequently applied levelling compounds, which reduces their flow properties.
Before levelling over sand and cement screeds and concrete, prime with single coat of ARDEX P 51diluted 1:3 with water for sand and cement screeds or 1:2 for concrete and applied with a brush or broom. Once the ARDEX P 51 is dry, it can be levelled with an appropriate ARDEX Levelling Compound and then tiled with an ARDEX Cement-Based Tile Adhesive.
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