DRYLOK(R) natural look sealer is a non-yellowing protective coating that can be used as a sealer or concrete curing membrane. As a sealer, DRYLOK(R) natural look sealer penetrates deep to seal and protect masonry against acids, alkalis, road salts, de-icing compounds, household cleaners, gasoline, oil and weathering. Protects against dusting, staining and spalling. As a concrete hardener, When applied to freshly poured concrete, after the surface has set for 24 hrs and excess water has been removed, DRYLOK(R) natural look sealer will control water evaporation resulting in maximum concrete hardness.