Ardex Feather Finish Self-Drying Cement Based Grey Pack of 4 Bags 10 Lbs Cement-based finishing underlayment Exceptional bond strength provides a smooth finish to a variety of substrates prior to floor covering Easy to mix and apply mixes with water only&#44; no primers or additives necessary True featheredge allows for greater coverage Mold and mildew resistant will not contribute to staining of floor covering