TB15 is a natural repair mortar specifically formulated for the patching and restoration of terracotta and brick. TB15 can be used to repair small chips and spalls in terra cotta and brick. TB15 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. TB15 has excellent freeze-thaw and salt resistance. It is vapor permeable. TB15 is specially formulated to set quickly, and repair surfaces of terra cotta and brick. Weight: 48 lbs