Penetrating sealer for interior and exterior applications.  UltraCare Penetrating Plus SB Stone & Porcelain Tile Sealer is a premium, natural-look,  solvent-based penetrating sealer that uses VOC-exempt materials and will provide  maximum protection against most common stains for all interior and exterior natural stone (marble, limestone, sandstone, slate, granite, travertine, etc.), unglazed porcelain and ceramic tiles, masonry, quarry tiles and cement grout. The product can also be used as a pre-grouting sealer.