During 1940-46 the Chevrolet trucks came standard with an unusual interior paint. It added a little extra appearance with minimum extra expense. This has been referred to as “Hammered Paint”. While drying this paint develops a fish eye appearance.
On these years of GM trucks all removable interior sheet metal is given this style paint. This includes the dash, door panels, and rear sheet metal. The specialty paint is available from Jim Carters Classic Truck Parts and a few other full stocking dealers.