Abstract: A water-based coating composition that is particularly suited as a floor coating. The composition is an aqueous two-part or two-component polyurethane system, having a water-dispersible polyisocyanate component and a hard cyclic diol component. The composition may be applied over a primer coating. The composition can be applied as a fairly thin coating, e.g., less than 127 micrometers (5 mils) thick, and provides a suitable coating with one coat. The composition, when coated onto a surface such as a floor, can be cured under ambient conditions. The resulting coating provides a durable coating with high gloss.