Depending on the composition of the steel a ground coat may be required as a first coat. it would be applied as a dry powder as described above. a little thought will show how metal shields can be used to keep the enamel from falling on areas where a coating is not desired. metal shields can be used in creating designs. silver plated steel Vitreous enamel is glass bonded by fusion to a metal surface. the most common glass is a fusion of silica, soda, lime, and a small amount of borax. though normally transparent, various amounts of opacity can be produced by adding or growing crystals within the glass structure. There are 82 vitreous enamel steel panel suppliers, mainly located in asia. the top supplying countries or regions are china, taiwan, china, and turkey, which supply 85%, 13%, and 1% of vitreous enamel steel panel respectively. vitreous enamel steel panel products are most popular in eastern asia, southeast asia, and mid east. Porcelain (vitreous) enamel and industrial enamelling processes it was the authors deliberate intention not to substantially change the original book but to update and expand it with the numerous developments over the past 50 years.