BOSS® 850 Colors Silicone for Surfaces is a one-part, fungicidal, silicone rubber sealant and adhesive. It is designed to be used for sealing cultured marble, natural marble, granite and stone. BOSS® 850 is ideal for sealing marble panels, counter tops, sinks, plumbing fixtures, back splashes and cultured marble tub surrounds. It remains flexible and will not lose its bond to the substrate. Outperforms all solvent based adhesives.