This modeling compound works like clay and is great for sculpture and fixturing. To finish, bake hard, then carve and sand it like wood. You can also use this compound for your two-part molds. Simply pack the clay around the lower half of a flat model to precisely position the mold line. Then pour an RTV compound over the top half and allow it to cure. Remove the modeling compound and pour the RTV compound over other half, setting the mold line exactly where you want it.