Thompson enamel has been a manufacturer of vitreous enamel for metal for over 119 years. thompson enamel currently manufactures glass products for many different kinds of applications. included in its product line are enamels for both metals and glass. Largest selection of enamel online! brands include: thompson, ninomiya, w.g. ball, sunshine, schauer, milton bridge. Products + services. the products that surround you in life aren’t built by ferro. but, our functional coatings and color solutions are part of those products – in more ways than you can imagine. Jun 04, 2019 · questioncan you use the enamel for glass (effetre) on metal and vise versa? enamel for soft glass 104 effetre falls in the same coe range as metals. so you can use them on metal. however the reverse is not true. you can't use the enamels for metals on glass. there are more color choices for metals.