Our waterproof sealant contains pure acrylic emulsion, silicone acrylic emulsion and defoamer. It can not be deformed at high temperature, does not melt, does not crack at low temperature, has good weather resistance, can solve the roof, exterior wall, window sill, bathroom, basement, gutter, parapet and other water leakage repair problems. Its use method is very simple: clean and dry the inside and outside of the crack, take the right amount of glue evenly spread on the crack, about 12 hours later, the second evenly spread. And it's leak-proof.