EC-3 JS emulsion is used in the preparation of waterproof coatings, which has good calcium ion stability and excellent compatibility with fillers such as cement. After film formation, it has good elongation and resilience, as well as good adhesion, water resistance, and excellent acid and alkaline resistance. Made waterproof coating for use in toilets, bathrooms, kitchens, and roofs, environmentally friendly and non-toxic, it is a substitute for polyurethane waterproof coating, SBS waterproof membrane, and EPDM waterproof membrane.