Our tops are coated with a grout sealant. The finest protection available, this sealer provides extraordinary resistance from stains and moisture and helps maintain the tops's natural color. For optimum protection, tops should be re-sealed every 6-12 months. It takes just a few minutes to distribute an even coat of sealer. Grout sealer is readily available in most hardware stores and Home centers. Always follow the sealer manufacturer's instructions. As with all cement like products during consistent, deep freezing temperatures, we recommend the tops be brought inside.