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Lost wax and lost foam are two very similar methods used to make very accurate metal castings for all kinds of different alloys. The first is called lost wax or investment casting. This process begins with the production of a heat disposable wax pattern made by a precision tool. This is what the shape of the finished product will look like. After several wax patterns have been created, they are placed onto a gating system for the molten alloys to flow. The Patterns are then covered with a thin layer of a sand and a ceramic mixture. The wax is melted out using some form of heat and the ceramic mold is then cured in an oven for several days. Final