This Bone colored Polyblend Sanded Grout is a cement-based polymer-modified grout that creates firm, compact joints that resist shrinking, breaking, and erosion. Polyblend Sanded Grout is a durable interior or exterior grout that can support 1/8 in. to­ 1/2 in. (313 mm) joints. It can be used on floors, countertops, walls, ceilings, showers, fountains, and pools, among other things.