Water and Oil repellent for protection of stone façade, floors and stone products against penetration of water, humidity, oil, alimentary grease. It prevents mildew formation. Its chemical composition allows the treated material to breathe and allows humidity to exit from the stone but prevent the same from entering. Block D-70 is for internal and external use..Test carried out in laboratories demonstrate resistance to UV rays. The stone treated does not change its color after long exposure to UV rays. It prevents formation of mildew. It is water based product certified by NSF international as acceptable as a coating for use on surfaces with the possibility of incidental contact with food.