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Plastic is harder, silicone is more elastic. Plastic can crack over time, and silicone can tear. And the cost of plastic is lower than silicone, so plastic molds are cheaper.
Hello .For preparation of concrete using high-grade cement, slag-free. Sand should not contain impurities clay. To reduce the amount of water in the solution, be sure to add the plasticizer concrete on the maximum recommended by the manufacturer. Number of plasticizer is calculated with respect to the cement. When mixing concrete, use 1 part cement, two parts sand. The solution should not be highly liquid. To check him take in his hand, he must not flow through parted fingers.
It depends on the climate in which you live. It usually takes about 24 hours for the concrete mixture to dry completely. If you have a humid climate it may take longer. You need to focus on the complete drying of the concrete so that the product is not damaged.
Nice. If you were to fill a mold with dry concrete would that roughly be the amount of concrete you need for that mold? Trying not to waste concrete here.
Hello .For preparation of concrete using high-grade cement, slag-free. Sand should not contain impurities clay. To reduce the amount of water in the solution, be sure to add the plasticizer concrete on the maximum recommended by the manufacturer. Number of plasticizer is calculated with respect to the cement. When mixing concrete, use 1 part cement, two parts sand. The solution should not be highly liquid. To check him take in his hand, he must not flow through parted fingers.
Thank you for the question. In addition, a small amount of silicone spray can be used in molds before using concrete. Remove the remainder of the spray with a soft cloth. If you plan to paint a finished product. I recommend using an release agent with no fat content. After all, the residual fat can affect the quality of coloring.
