ARDEX FEATHER FINISH Self Drying, Cement Based Finish Underlayment mixes to a creamy, smooth finish underlayment that eliminates flooring installation problems associated with disbonding, crumbling, mold, mildew and staining. It may be used as an embossing filler when mixed with ARDEX P 82TM Ultra Prime. Install over: concrete, masonry, wood, terrazzo, and ceramic and quarry tile as well as properly prepared residues of cutback and other non water soluble adhesives on concrete all without the need for priming or the use of a latex additive.