Abstract: A composite part (10) and a mold (12) having different coefficients of expansion are allowed to move differentially while being cured under conditions in which both heat and pressure are applied to the mold and part. A sheet of flexible material (18) that is a solid at room temperature and a viscous liquid at the elevated curing temperature is placed between a pair of flexible parting films (14, 16). The resulting laminate is interposed between the part and the mold pair to subjecting them to elevated curing temperatures. The flexible material in the laminate becomes a liquid at the elevated curing temperatures and thus provides lubrication between the parting sheets so that the part can move relative to the mold.