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First of all, you’ll have to use the not-stick cooking spray to treat the inside of a larger mold and the outside of a smaller mold. Then, prepare your mixture according to the manufacturer’s instructions. Make sure to get enough solution. The next step is to pour the mixture into the outer, bigger mold and place the smaller, inner one into it. Make sure that it’s centered before you add the weights into it. Don’t add too much weight but just enough to leave a layer of solution at the bottom of the mold. It’s better when its thickness is the same as the distance between the inner and outer molds. Adjust the weights until you’re satisfied with the results and pour a little bit more solution if you need to. Let the concrete dry, sand the final product from the outer side to ensure smooth finish and you’re done.