Overall waterproof construction steps clean the floor to ensure it is dust-free and water-free brush the first time and wait for it to dry after 24 hours, brush the second time after 48 hours, you can enter the water Cracks and large area painting methods: Cracks smaller than 3 mm must be reinforced with polyester cloth (spread the polyester cloth immediately after the first coat, and then paint the second time).Cracks larger than 3 mm must be filled with cement before painting. Apply the first coat of waterproof to the place where the waterproof surface needs to be made, and you must make it not stick to your hands before brushing the second time. The specific interval depends on the temperature and ventilation. After 48 hours after construction, it can only be exposed to water.