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Molds & Mold Rubbers for Concrete Countertops

Length - 03:45

Making molds for concrete countertop edges and inlays is an artistic way to add interest and a customized look to any kitchen, bathroom, or vanity countertop. Award-winning designer and concrete countertop fabricator Fu-Tung Cheng shows how to make custom concrete molds using a melamine form and liquid rubber.

Cheng often augments the edges of countertop with unique designs. He uses polyurethane rubber to make these custom molds. This is a two-part compound that you mix right before making the mold. When dry, this liquid forms a hard rubber of varying flexibility.

For example, Cheng created a mold from an egg and dart pattern that was originally on a Victorian wood molding. To make a mold of this pattern, simply build a box to the width and length desired with the original wood molding face-up in the mold. Mix the two-part compound. Then spray the inside of the mold with the manufacturer recommended release agent and pour the liquid rubber into the mold.

Make sure that stray hairs or dust are kept out of the mold as every little detail will be reproduced in the rubber mold that is made. Cheng uses a variety of original Chinese carvings and geometric moldings to make one-of-a-kind rubber molds.

Mold rubber can also be a great tool for making integral sink molds. In this situation, you have to make the original out of foam. Then the sink mold that is made out of foam can be reproduced in the polyurethane rubber that will last much longer.