MT15 is a natural repair mortar specifically formulated for the patching and restoration of marble and travertine in traffic areas, window sills and steps. MT15 can be used to repair small chips and spalls. MT15 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. MT15 has excellent freeze-thaw and salt resistance. It is vapor permeable. Skilled masons can easily apply MT15; no special certification is required. Weight: 48 lbs