Nowadays, there is a new enamel coating process, which is called direct on one time coating. it has only one coat, can be both ground coat and cover coat, only need one time to coat, and one time firing, then the products can be done. enamel frit manufacturing. enamel frit is glassy state silicate or borosilicate coated on metal body. Where can i buy white cover coat for enamel subway panel , find complete details about where can i buy white cover coat for enamel subway panel,cover coat,porcelain enamel steel sheets,enamel frit from supplier or manufacturer-hunan noli enamel co., ltd. Porcelain cover coat enamel frits raw material for enamel coating from china factory, us $ 8601,330 / ton, hunan, china, noli, etw-222.source from hunan noli enamel u2026 As well as from free samples. there are 226 glaze frit enamel powder suppliers, mainly located in asia. the top supplying country or region is china, which supply 100% of glaze frit enamel powder respectively. glaze frit enamel powder products are most popular in western europe, south america, and eastern europe.