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You can do either. Many vendors are happy to sell you the castings but they are very simple to make, using easy to make rubber molds. Usually a two part rubber that you mix per instructions and apply to the "model," in this case an interesting rock fragment or something with the texture & look of rocks, perhaps a coarse piece of bark or broken bits of ceiling tiles. <br /> <br />Most hobby suppliers sell the latex or silicone rubber for molds. You then mix your casting material & pour it into the mold. Some materials are hydrocal and other plasters, Sculptamold or two-part plastic. <br /> <br />Wayne
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