Coil Coating is the continuous and highly automated process for coating coiled sheet metal before fabrication. Coil Coating was originally developed in the 1930's as a process for Venetian Blinds. Today, approximately 5 million tons of aluminum and steel are coated annually. Building products, which historically have been the largest industry users of aluminum. Transportation currently ranks number two in aluminum coated markets. The fastest growing channel for pre-coated coil is through distributors or metal service centers selling to a variety of end-use applications.