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WebThe shell moulding process consists of making a thin mould around a heated metal pattern. The moulding material used is a mixture of dry fine silica sand and 3 to 8 percent of a … WebDec 18, 2012 · Silicone block molds are fine for making casts of small objects. But for larger items, like this 3′ prop gun, you’d need hundreds of dollars’ worth of silicone to make a block mold. An excellent and inexpensive solution is to use a thin layer (or “blanket”) of silicone, that’s keyed to a hard-shell or “mother” mold. cf82 7wx

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