Arc Grout & Tile Sealer penetrates into absorbent natural stone surfaces and fills the nano pores and capillaries with an invisible film of polymers. The unique Micromesh Technology formula of Arc Grout & Tile Sealer may be applied to damp stone and grout immediately after installation. Protects all types of natural stone, travertine, terracotta, limestone, marble, granite, sandstone and many other products against oil and water-based stains.