An economical and proven new process for manufacturing large automotive parts in high volume is exciting Detroit. The Bailey Division of USM Corporation, an Emhart Subsidiary, has demonstrated commercially that large automotive parts can be injection molded using glass-fiber reinforced thermoset polyester polymers. More particularly, the process lends itself to the manufacture of parts with Class A surfaces without sink marks from ribs and bosses showing. There are advantages for the design engineer, the parts manufacturer and the assembly plant. Dimensionally stable, light weight Class A surface parts that can be painted on the body assembly paint line can now be made using readily available raw materials.