KY501  is based on the KY-50 foundation stone bottom surface sealants, adding more amount of resin to be relative to the bottom surface of the stone KY-50 has a higher viscosity sealants and adhesion, can penetrate the pores of the stone and the inner bottom surface microcracks , filling the pores and micro-cracks, blockage, and the back of the stone layer of tough and transparent protective film is formed, excellent alkali resistance, can effectively prevent the inhalation of concrete mortar with a strongly alkaline water when the natural stone and concrete bond caused by stone disease (such as: Bai Hua, vomiting yellow, rust, water spots and other stone disease), wet paste of dry hanging construction to achieve the desired effect. And in fine sand with the adhesive surface can be brushed stone and concrete, the adhesive force can be greatly enhanced stone and cement mortar, wet paste to prevent the hollowing stone and concrete due to problems caused by adhesion or even fall off construction quality and safety problems.