Readers ask: How To Make Concrete Molds And Forms?

What can I use as a mold for concrete?

Something as simple as a plastic pumpkin could be your next concrete mold. Because plastic pumpkins already have the jack-o’-lantern face embossed on their surface, you don’t have to carve anything—you can create a smiling pumpkin simply by pouring Quikrete concrete mix directly into the plastic bucket.

How do you make a mold out of household items?

The recipe for using Household Items for Making Molds:

  1. Buy 100% silicone caulking.
  2. Squeeze it out into a bowl.
  3. Mix 5 tablespoons of cornstarch into the silicone.
  4. Wipe our original shape with a mold release, such as vegetable oil or vaseline.
  5. Pour the silicone over the object you want to mold.
  6. Let cure.

What does concrete not stick to?

Paint – Paint is another material that has no natural bonding agents, so concrete generally won’t stick to it very well. Oil – Oil or oiled surfaces are often used to make the surface resistant to concrete bonding.

What is the best material for making a mold?

Polyurethane and Polyester Resins– As mentioned in the previous section, silicone rubbers are generally the best option for casting these materials. Upwards of one hundred parts can be cast in these molds. If you only require 10-20 cast parts, then you might opt to use less-expensive polyurethane mold rubber.

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How do you make homemade concrete dye?

Add a latex paint or any water-soluble paint to a concrete mix. Use the paint like water in the same proportion when adding it to the concrete. Additionally, any type of powdered paint pigment can be mixed with water in a bucket and added to the concrete.

Can you use cardboard as a mold for concrete?

You could cast concrete in a cardboard box except for one thing – it’s not water tight. The cardboard will suck the moisture out of the concrete, leaving a chalky finish at best. At worst the box will blow out or fall apart before the concrete has cured.

What can I use for soap molds?

Just about any container can be turned into a soap mold with proper lining. If the container is plastic, the soap can be poured directly without lining. Popular options include yogurt containers, pudding cups and tofu containers.

How do I make my own silicone molds?

  1. Step 1: Make Your Catalyzing Solution. By mixing a high-concentration of dish soap with water in a bowl, one is actually making a catalytic bath for your silicone.
  2. Step 2: Catalyzing the Silicone.
  3. Step 3: Preparing the Silicone.
  4. Step 4: Make Sure the Mold Is Water Tight.
  5. Step 5: Let It Cure.
  6. Step 6: Use Your Mold!

How do I make my own candle molds?

  1. Step 1: Select a Model.
  2. Step 2: Construct a Mold Box & Secure the Model.
  3. Step 3: Apply Sealer & Release Agents as Necessary & Finish Preparing the Model.
  4. Step 4: Measure, Mix & Pour Silicone Rubber.
  5. Step 5: Demold & Cut Mold (if necessary)
  6. Step 6: Pour Wax into Mold.
  7. Step 7: Remove Candle from Mold.
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What do you use for round concrete forms?

Plywood. Plywood can be used for large circles where the arc is wide and gentle. They can be scored on the back with cuts about 2/3 the depth of the board, spaced about every half inch along its length. This will increase the flexibility of the wood as the cut spaces will expand as pressure is applied to bow the board.

How do you make a wood mold for concrete?


  1. Cut the Melamine Board to Size. With the circular saw, cut the 4-foot by 8-foot melamine board into the following pieces:
  2. Clamp the Long Side Walls to the Mold Base.
  3. Add the Long Side Walls to the Mold Base.
  4. Add the Short Side Walls to the Mold.
  5. Bevel the Corners.
  6. Remove the Excess Caulk.

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