This is a fine grade of 325 mesh the correct fineness for cold casting. Copper or other metallic powder is added to polyester resin, polyurethane resin, epoxy, gypsum cement or other binders. Small objects are cast and cured in suitable molds. To conserve metal when casting large pieces you can dust (salt) the mold surface, brush a thin coating on the surface, spread or roll the metal on or spray a thin coating. Visit them on https://www.artmolds.com/copper-powder.html or call at (866) 278-6653 for details.
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