HS60 is a natural repair mortar specifically formulated for the patching and restoration of sandstone. Designed to repair any surface areas of sandstone including traffic areas, window sills, steps and any surface area at least 1/4″ in depth. HS60 is a mineral-based, single component product that is mixed with water. It is formulated using only natural binders; no synthetic polymers or additives are used. HS60 has excellent freeze-thaw and salt resistance. It is vapor permeable. Weight: 48 lbs