The latest development of the SurfControl limestone ( lime stone ) special protective agents have more content, more reasonable in formula. The protective agent can effectively penetrate into pores within the 1-3mm stone and stone combine to form a deep lasting protective layer, surface without leaving any trace, does not change the stone color, does not affect the stone permeability, can effectively prevent the next tide infiltration, and prevent water and pollution from external invasion. The same stone bottom sealant KY50 or stone interface tackifier KY55 use, can effectively prevent the stone water spots do not dry, salt alkali ( Hua ), spit yellow and other pathologies that occur. The protecting agent has excellent aging resistance, ultraviolet resistance, weather resistance for more than 10 years, the main active ingredient is the United States FDA ( the United States Food and Drug Administration approved substances ), product after curing in contact with food, no toxicity, no harmful to human body.