apparatus and a process for manufacturing multiple color thin - walled hollow sheels for parts such as automobile door panels , consoles and instrument panels from dry thermoplastic plastisol includes a supply box with a divider to form two or more compartments in the box . the box divider cooperates with selectively positioned split mold parts defining a separation in an open - ended heated mold for separating the mold into two or more sections . complementary open ends of the charge box and mold are joined . then the apparatus is 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 resultant shell of cured material ; thereafter the powder box is removed and the split mold parts are joined to clamp cast shell segments for fusion at a joint line .