Additional Details ------------------------------ Product description: Anti-stain, water and oil proof sealer. HYDREX can be used on all types of stone. It is especially affective on polished marbles, such as carrara, thassos, trani, botticino, marfill, and similar stones. HYDREX may be used both indoors and outdoors. It does not change the color of the stone. HYDREX operates on the surface of materials. It stops micro porosities so that it prevents liquids (stains) from penetrating into the material while at the same time allows the stone to breathe to maintain its natural characteristics.