White Mountain Invisoseal™ is a penetrating water sealer that provides up to 10 years of invisible protection for stone, concrete and masonry surfaces. Invisoseal utilizes micro-emulsion technology to deeply penetrate porous surfaces, retaining the natural color and finish of stone, unglazed tile, or decorative concrete. Specifically developed to repel water, dirt, mildew and algae stains, this non-gloss sealer also works as an effective grout release. Invisoseal is perfect for vertical applications, providing superior protection while retaining the natural beauty of the chosen substrate.