ARDEX K 523™ is a Self-Leveling Concrete Topping that can be polished to quickly cover interior concrete. ARDEX K 523 can be installed from a minimum thickness of 3/8” (9 mm) to a maximum of 2” (5 cm). Use ARDEX K 523 for a polished, “exposed aggregate” surface. It can be polished in as little as 24 hours. key features A combination of Portland cement, other hydraulic cements, and special black and white aggregates For interior concrete coating Can be walked on in 2-3 hours and polished in just 24 hours For use on interior floors only standards Tested in accordance with ASTM C1708