Lithofin Stainstop W is a water based special impregnator which effectively protects surfaces against the penetration of oil, grease, dirt and water. As the product is solvernt free it has different chemical properties to solvent based MN Stainstop. Therefore, the application method differs slightly. The product penetrates into the surface and forms and extremely thin invisible film in the capillaries of the stone or slate. The appearance of the treated surface is either unaffected or only slightly altered.