This invention relates to a continuous flow process of mold making or die making using a reusable bondable mixture substance to make selected finished products. The bondable mixture substance includes a mixture of preferably ventonite clay, sand, and a lubricant such as oil all mixed and bonded together so that impressions can be made in the mixture substance to make end-to-end molds or dies which are moved on a conveyor belt through a plurality of zones in which some type of work is perform on the mixture substance which is mixed and dispensed on the conveyor belt, smoothed and rolled to a specified uniform consistency, imprinted with a mold maker to form the molds or dies, injected with a hardenable material, heated to form cured finished products from the hardenable material other than metal, allowed to separate from the finished products and delivered back to the start of the process to a holding bin by another conveyor belt, and again mixed and reused to form end-to-end molds or dies for making selected finishes products such as structural materials.