Sealing natural stone and masonry materials exposed to the elements, especially around a swimming pool. is critical to protect the structural integrity and maintain aesthetics. Prolonged exposures to sun, pool water, dissolved organics and chemicals can stain, erode, crack and fade stone surfaces in and around your swimming pool. We recommend sealing your stone when new; however if the damage has already occurred; Let Watermark Pros can restore and protect the beauty and integrity of your exterior stone surfaces. We use only the highest grade Penetrating Polymer Emulsions to protect not only stone surfaces, but into the structure of your stone!