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How to Cast Cultured Marble
- 1). Apply mold release to the mold if recommended by the manufacturer. Urethane, latex and silicone molds typically require mold release when used with casting resin.
- 2). Measure both parts of the casting resin into a clean mixing container as directed by the manufacturer. Many casting resins are combined in a 1-to-1 ratio, but some use small amounts of hardener added to a much larger quantity of resin.
- 3). Mix the two parts of the resin together thoroughly for two minutes or as suggested by the manufacturer. Scrape down the sides and stir contents up from the bottom with the stirring stick.
- 4). Stir marble powder into the resin a little at a time until you reach the desired color and consistency. Mixtures for highly detailed molds should be liquidy; mixtures for simple shapes can be much thicker, up to the consistency of peanut butter.
- 5). Pour the resin mix into the mold, a little at a time. If the mix is thick, gently agitate the mix in the mold after each pour to settle the mix into the mold.
- 6). Lightly heat the exterior of the mold with a hair drier to prompt bubbles to rise to the surface.
- 7). Allow the resin to fully cure for 72 hours at room temperature.
- 8). Remove the casting from the mold. If the mold is rigid, twist the casting slightly to free it. If the mold is flexible, carefully peel it away from the casting.
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