How To Make Concrete Molds

Choose cardboard for molds with rounded edges irregular dimensions or simple straight sided geometric shapes.

How to make concrete molds. Use wood only for straight sided shapes such as squares rectangles or triangles. Pure silicone caulking like this make sure it isnt latex 1 box of corn starch rubberlatex gloves a non precious bowl vaseline as a mold release a critter to use as the master form or make your own. Polytek recommends using a 74 45 or a 75 60 material for concrete countertops. While this mold is specific to this project the method is the same for a lot of different types of concrete projects.

Drill pilot holes and secure the pieces around the perimeter of the base with wood screws. There are two main suppliers of urethane rubber for concrete molds. Concrete casting pros from around the world know smooth on liquid rubber products as the industry standard for making rubber molds that have the abrasion resistance and tear strength needed to keep production moving. Making your own concrete molds stuff youll need step one step two step three.

Place a screw along the centerline of the support pieces every 4 to 6 inches. Both make polyurethane rubbers that come as two part liquids resin and hardener. Then add water till you get a soupy consistency. Cut off top of water bottle and then make a second cut an inch above the top of the object to make a tube for the mold.

Step 1 create the edges of the form for the mold using cardboard or wood. Best concrete mix for molds you want to use a ratio of 3 to 1 3 part sand 1 part cement the sand i use has pea gravel in it and you mix this in the wheelbarrow till you cant see the color of the sand. Jan 18 2020 explore darrell tiptons board concrete molds followed by 368 people on pinterest. See more ideas about concrete concrete diy concrete projects.

Screw the side support pieces to the base on each side. Whether youre making a side table like mine a planter box or a poured table top youll need a good strong mold to hold it in and something that the concrete wont inevitably stick to. Select the object being molded and cast. How to make concrete molds.