Abstract: A coated article which includes a cement fiberboard substrate and a radiation-curable coating system applied to the substrate. The coating system includes a latex polymer, one or more olefinic compounds and water, and may be provided in the form of one or more coating compositions that may be applied in one or more layers, wherein each of the coating compositions is preferably an aqueous composition, or can be mixed with another composition (e.g., on the substrate) to form an aqueous composition.