OSI SC175 White Synthetic Rubber Acoustical, Draft, Smoke & Sound Insulating Sealant 28 oz (Pack of 12).SC175 is developed primarily for commercial construction utilizing light weight cavity walls and floor systems. Used successfully in office buildings, hotels, apartment complexes and other types of commercial and residential construction; exposed and unexposed applications at perimeter joints, floor and ceiling runners, cutouts in gypsum board, veneer plaster systems and other areas where a sound rating assembly is required. Can be applied or buttered