UltraCare Penetrating Stone, Tile & Grout Sealer is an economical, natural-look, water-based penetrating sealer that protects against most common stains for all interior and exterior natural stone (marble, limestone, sandstone, slate, granite, travertine, etc.), unglazed ceramic tile, masonry and cement grout. The product contains silicon as a siliconate ion and can be used as a pre-grouting grout sealer.