Invisible Sealer is an invisible clear silicone sealer that will maintain the natural look of the tile. Invisible Sealer may be used LOW POROSITY tiles only (e.g. low porosity terracotta, granite, marble and porcelain), and will repel water and most oils. Invisible Sealer is suitable for interior and exterior applications. Invisible Sealer penetrates into the tile and therefore maintains the anti-slip factors of the tile.