ClassNK Issues World’s First Approval for Alternative Coating System for Ballast Tanks under PSPC. ClassNK announced today that it had awarded type approval for the world’s first alternative coating system under PSPC (Performance Standard for Protective Coatings) for ballast tanks to a single coating system manufactured by Nippon Paint Marine Coatings Co., Ltd. This approval is the first to be issued by any classification society anywhere in the world. Under PSPC, conventional epoxy coating systems are required to comprise two coatings.