Surecrete 45102007 XS-327 Part B Matte/Semigloss is a premium concrete countertop sealer that when fully cured is a food-safe clear coating. Available in semi-gloss or matte finishes, XS-327 anti-microbial is a water-based polyurethane that is UV stable and scratch resistant clear concrete sealer. With an anti-microbial agent added, it contributes to safety and well being by inhibiting growth and spread of bacteria, mold and algae on treated surfaces.