Poro seal is a solvent base ready to use, water repellent impregnator for medium and high absorbing stones. A clear, penetrating water repellent designed for the ultimate protection for porous natural stone and masonry surfaces. It contains a special formula of polymeric siloxane in a mixture which produces an exceptional resistance to water. It provides long term resistance to high heat an makes cleaning treated surfaces easier. Poro seal penetrates into the pores of the stone forming an invisible barrier. Generally it does not affect the natural colour of the treated support. Only on some stones there could be a little change.