Hydrophobic agent is a new type of high-efficiency waterproof material that is pollution-free and non irritating, and is widely used in advanced countries around the world. After spraying (or brushing) on the surface of a building, this product can form a colorless, transparent, and UV resistant breathable film on its surface that is not visible to the naked eye. When rainwater blows on it or encounters humid air, water droplets will naturally flow, preventing moisture from entering. At the same time, it can also wash away dust on the surface of the building, thereby preventing moisture and mold on the interior walls, keeping the exterior walls clean, and preventing weathering.