This product is a high-quality elastic putty powder specially developed for building exterior wall substrate treatment. It is scientifically formulated with high-quality polymer special cement, ultra-fine fillers and imported functional additives. It possesses excellent flexibility, bonding strength and weather resistance. It is suitable for leveling, repairing and decorative base treatment of various exterior wall surfaces such as cement mortar surfaces, concrete surfaces, and masonry surfaces. It effectively solves the cracking problems of exterior walls caused by temperature changes, structural settlement, etc., and provides a solid, flat and durable substrate guarantee for exterior wall coating systems such as exterior wall paints and real stone paints.