Appearance. enameled cast iron and enameled steel are manufactured using a similar process in which a porcelain enamel coating is baked onto the sink substrate. Nov 01, 2017 · porcelain sinks are a lot heavier than stainless-steel, and as such the use of a professional installer is highly recommended. the cabinet that supports the sink will also need to be stronger, an undermount sink will require more supports and braces. Jun 20, 2019 · cast iron sinks are heavier than stainless steel ones, and they are coated with porcelain enamel that can chip. both types of sinks can be stained and both require roughly the same type of care. if you're budget conscious, choose stainless steel. it costs several hundred dollars less on average. Enamel pans are made from a cast iron or steel base, then coated with porcelain enamel to give the pan a smooth non-stick surface. the porcelain coating is made from natural clay that has been baked and glazed to make it very hard and durable.