Definitions. In this regulation, the following terms have the meanings indicated: “Can coating” means all operations that deposit a coating on metal intended to be made into two-piece cans or three-piece cans with cemented, soldered, or welded side seams. “End seal compound coating” means a coating applied onto can ends which functions as a gasket when assembled on the can. “Exterior base coat” means a coating applied to the exterior of a can to provide protection to the metal and to provide background for the lithographic or printing operation. “Interior base coat” means a coating applied to flat sheet stock which is intended to provide a protective lining to the inside of the can. “Overvarnish” means the final coating applied over decorative images on the surface intended to be the can exterior. “Three-piece can side seam spray” means a coating applied to the can surface joint when forced from sheet stock to protect the exposed metal. “Two-piece can exterior end coating” means a coating applied to the exterior end of a can to provide protection to the metal. Emission Standards. A person may not cause or permit the discharge into the atmosphere of any volatile organic compound from can coating in excess of the following emission standards: