A penetrating silicone that seals grout lines from water, stain penetration, and mildew. Use on glazed ceramic tile and grout. Not intended for use on unglazed tile, slate, or marble. Seals new and existing grout lines. For maximum protection reapply every 12 months. Do not allow product to dry on tile, wipe up immediately. Allow 1 to 2 hours to dry before exposure to water.