After the surface is dry. Saint-Gobain caulking paste is made of high-quality desulfurized gypsum, environmentally friendly additives and other materials, and is formulated with a patented formula. The product ratio is strictly controlled during manufacturing to minimize shrinkage. During use, add water and powder directly, stir, and then It should be applied to the surface before construction, and after the surface is dry, affix 50mm wide protective tape on both sides of the 10mm gap to prevent excess polyurethane glue from staining the surface of the structure during construction.