apparatus and a process for manufacturing multiple color thin walled hollow shells for parts such as automobile door panels , controls and instrument panels from dry thermoplastic powders includes a powder box divider to form two or more compartments in a powder charge box and means for joining the chrage box divider end - to - end with a mold separation edge on an open - ended heated mold for separating the mold into two or more sections ; each compartment of the charge box has a different color powder . the charge box and mold are joined and then are rotated so that the powder is distributed into each mold section by gravity flow with the powder from each section flowing to the divider which separates the colors so as to form two or more tones on a resulting shell of cured material .