Shenzhen zhongshenglong waterproof decoration company should first deal with the cracks, chisel the cracks into V-shaped bell mouth, and then fill the cracks with leakage stoppers after cleaning the base surface, and then brush the cracks with elastic waterproof coating after smoothing the cracks by the leakage stoppers. The overlapping parts of cracks and base surface must be more than 5cm. The elastic waterproof coating can be JS waterproof coating type I product; acrylic elastic waterproof coating or 911 polyurethane waterproof coating, one of three can be selected. When brushing, non-woven fabric or polyester cloth can be added in the middle to increase the waterproof effect and prevent the waterproof layer from aging. When doing the above waterproof, it is better to make a layer of mortar protection layer above to protect the waterproof layer.