metallist valuvormide, nt kokillide, survevaluvormide jms sulametalliga kokku puutuvale sisepinnale kantav suhteliselt paks tulise (tulekindla materjali) (nt vormisegu) kiht vormide püsivuse tõstmisek, in foundry practice (thick) coating to protect the mold from erosion and soldering by preventing the metal from contacting mold surfaces, thus increasing mold life (compare: lining)