Stone Sealer #2 is a reactive silicone polymer emulsion in water which impregnates and seals the stone surfaces to leave a natural finish without the release of any volatile organic compounds (VOC) which means that it can be applied in enclosed or occupied premises where stricter clean air and VOC standards are enforced. This is the sealer that we most often recommend for sale to the general public for the maintenance of marble, granite, travertine, slate, onyx, limestone and all types of natural stone surfaces after installation because it is lot easier to apply than some of the solvent based alternatives.