Yes, but not for long. Suitable for temporary emergency. It relies on a protective film formed in the water tank after water is dissolved to repair the water leakage point. It covers the whole inner wall of the water tank instead of just blocking the leaking part, which is equivalent to increasing the thickness of the inner wall of the water tank. Because the automobile water tank plugging agent is mainly used for emergency, if it is used for a long time, it is easy to be directly dissolved in the vehicle coolant due to high temperature, leading to vehicle failure.