The JG/T 210-2018 standard specifies the classification and marking, requirements, test methods, inspection rules, signs, Encasement and storage of undercoats for interior and exterior walls of buildings. These undercoats are mainly made of synthetic resin emulsion and solvent-type Resin as the main binder, and are made with additives, pigments, etc., which are suitable for painting preparation on the surface of various interior and exterior walls of buildings. The standard refers to a number of relevant standards such as GB/T 1728-1979 (determination of drying time of paint film and putty film), GB/T 1733-1993 (determination of water resistance of paint film), etc., to ensure the stability and durability of undercoating performance before and after construction. In addition, the standard also covers the Encasement mark of Coating products, storage requirements and inspection rules before use, aiming to improve the mass and construction efficiency of undercoating products.