How to Make a Silicone Mold

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Silicone molds come in all kinds of shapes, sizes, and designs, but sometimes you just can’t find the perfect mold for a piece you’re working on. No worries—you can make your own mold right at home, and the process is actually really easy. You just need soap, silicone caulk, and a piece you want to make a mold out of. That’s all!

Things You Should Know

  • Make a 1-part soap, 10-parts water mix and add your construction silicone. Press your desired shape into the clay and wait a few hours for it to dry.
  • Or, knead together 1-part silicone 2-parts cornstarch. Press your shape into the dough and wait just 20 minutes for your mold to dry.
  • Alternatively, purchase a kit and follow the directions carefully. Typically, this process takes a few hours.
Method 1
Method 1 of 3:

Using Silicone and Liquid Soap

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  1. The water should be about room temperature—not too warm and not too cold. It should be deep enough for you to stick your hand into. [1]
  2. You can use just about any type of liquid soap, including: body wash, dish soap, and hand soap. Keep stirring until the soap has completely dissolved and no streaks remain. [2]
    • Plan on using about 1 part soap to 10 parts water. [3]
    • You can also add liquid glycerin . The glycerin will react with the silicone and cause it to clump together. [4]
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  3. Purchase a tube of pure silicone from the home improvement store; make sure it is not the quick-set kind. Squeeze enough of the silicone into the bowl to cover your desired item with. [5]
    • Construction silicone may also be labeled as silicone caulk.
    • If your tube of silicone did not come with a syringe, you will need to purchase a caulking gun , insert the tube, cut the end off, then poke a hole in the tip. [6]
  4. Put on a pair of plastic gloves, and reach into the water. Grab the silicone with your fist and squish it together. Knead it until it is no longer sticky while keeping it under the water. This will take about 5 minutes. [7]
  5. Begin by rolling the putty into a ball between your palms. Press it against a flat surface, and lightly push down on it. It still needs to be thicker than the item you will be molding. [8]
    • If the silicone is sticky, coat your hands and work surface with a thin layer of your liquid soap. [9]
  6. Make sure that you are pressing the item with the design side face-down into the putty. Gently press the edges of the mold against the item so that no gaps remain. [10]
  7. Silicone will never turn rock-solid; it will always remain flexible. Simply wait a few hours for the silicone to turn rigid enough so that you can still flex it, but no longer dent it.
  8. Take the mold by the edges, and bend it backwards and away from the item. The item should loosen or pop out on its own. Tilt the mold upside-side to tip the item out.
  9. Fill the mold with clay, then pull the clay out, and let it dry. You can also try to use resin in this mold as well, but let it cure and harden first.
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Method 2
Method 2 of 3:

Using Silicone and Cornstarch

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  1. Buy a tube of pure silicone from a home improvement store; it usually comes in a syringe-like container. Squeeze some of the silicone out into a disposable dish. You will need enough to cover whatever you wish to mold. [11]
    • You may also find construction silicone labeled as silicone caulk. Make sure that it is not the quick-set type.
    • If the silicone did not come with a syringe, you will need to get a caulking gun first. Insert the tube into the gun, cut the end off, then poke a hole in the tip. [12]
  2. If you can't find any cornstarch, try cornflour or potato starch instead. Keep the box handy; you might need to use more. [13]
    • If you want a more colorful mold, add a few drops of acrylic paint. This will not make the mold any more or less effective. [14]
  3. Keep kneading until the silicone and cornstarch come together and form a putty. It may be dry and crumbly at first, but keep kneading. If it is too sticky, add some more cornstarch into it. [15]
    • You may have some cornstarch leftover in your dish; this is fine. The silicone will have picked up all the cornstarch it needed.
  4. Start by rolling the silicone putty into a ball between your palms. Next, place it on a smooth surface, and gently press down on it to flatten it slightly. It still needs to be thicker than the item you wish to mold. [16]
  5. Make sure that you are pressing it design-side-down into the mold, and that the back is visible. Use your fingers to push the edges of the mold against the item; you do not want to see any gaps. [17]
  6. This will only take about 20 minutes or so. You are ready for the next step when the mold is rigid. It should still be flexible, but you should not be able to dent it or form it. [18]
  7. Hold the silicone mold by the edges, and gently bend it back and away from your item. Flip the mold over to pop the item out. If you need to, use your fingers to pry the item out.
  8. You can push pieces of wet clay into them, then pull them out and let them dry. You can also pour resin into the mold, let the resin cure, then pop it out as well. De-mold any castings the same way you de-molded your initial object.
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Method 3
Method 3 of 3:

Using 2-Part Silicone

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  1. You can find these in stores specializing in casting and mold-making supplies. You can also sometimes find these in a well-stocked arts and crafts store. Most kits will contain two containers labeled "Part A" and "Part B." Sometimes, you have to purchase them separately.
    • Do not mix the silicone yet.
  2. Find a cheap, plastic food container made from thin plastic. Use a craft blade to cut out the bottom. [19] Don't worry about how neat or jagged it is; this will eventually be the top of your mold.
    • Choose a container that is a little larger than the object you want to make a mold of.
  3. Remove the lid from the container. Cut several long strips of packaging tape, and lay them across the top. Overlap strip by about ¼ inch (0.64 centimeters). Leave a couple inches/centimeters of tape hanging over all sides of the container. [20]
    • Run your finger along the rim to create a tight seal.
    • Make sure that there are no gaps, or the silicone will pour out.
  4. Once you fill the container with silicone, there is a small chance that some may leak out from under the tape. This will kept prevent the silicone from leaking out all the way and ruining your work surface. [21]
  5. Place the container onto a flat, stable surface with the cut/open side facing up. Place your items into the box, and press them against the tape. Do not let the items touch the side of the container or each other. Also, make sure that the design portion of your item is facing up, and the back is pressed against the tape. [22]
    • Flat-backed items work the best for this.
    • Wipe the items clean beforehand, if necessary.
  6. You will always have mix Part A and Part B together. Some types of silicone are supposed to be measured by volume, while others need to be measured by weight. Read the instructions that came with your silicone closely, then measure them accordingly.
    • Pour the silicone into the cup included with your kit. If your kit did not come with a cup, pour the silicone into a plastic, disposable cup.
    • You need enough silicone to cover your items by ¼ inch (0.64 centimeters).
  7. You can do this with a skewer, a popsicle stick, or even a plastic fork, spoon, or knife. Keep stirring until the color is even, and no streaks or swirls remain.
  8. Use your stirring utensil to help scrape out any excess silicone so that you don't waste any. The silicone should cover the top of your item by at least ¼ inch (0.64 centimeters). If you make it too thin, the silicone mold may rip. [23]
  9. How long this takes depends on the type brand you are using. Some brands are ready to use in a few hours, while others need to be left overnight. Refer to the instructions that came with your silicone kit for more specific curing times. Do not touch or move the mold during this time.
  10. Once the silicone has cured and turned rigid, peel the tape away from the box. Gently slide the silicone mold out. You may notice thin "feathers" if silicone around your mold. If these bug you, trim them off with a pair of scissors or a craft blade.
  11. The items you placed into the box will be stuck inside the silicone. Gently bend the silicone back to pop the items out. It is a little like remolding ice cubes from an ice cube tray.
  12. You can now fill the cavities with resin, clay, or even chocolate (if the silicone was food grade). If you used clay, you can pop the pieces out while the clay is still wet. If you used resin, however, you must allow the resin to cure completely before removing it.
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Community Q&A

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  • Question
    Can the silicone-and-cornstarch mold withstand hot temperatures, such as liquid wax?
    T. Chinsen
    Top Answerer
    Hot wax melts at 37° C (99° F). Silicon can withstand temperatures up to 260° C (500° F), There is enough temperature range for melted wax to be put in a silicon mold without damaging the mold.
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    Not Helpful 16 Helpful 68
  • Question
    Can I use plaster of Paris in a mould?
    Cafra
    Community Answer
    Yes, you can use almost any "plaster" in the mold as long as the substance or putty is long and wide enough for your needs.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
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    Not Helpful 11 Helpful 21
  • Question
    Can I bake liquid poly clay in a homemade silicone mold?
    Alcyone Rainbow
    Community Answer
    Yes. Polymer clay and liquid clay are baked at around 265 degrees Fahrenheit, which does not damage silicone.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
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      Tips

      • Molds made using construction silicone and dish soap or cornstarch are not suitable for baking or candy making. The silicone is not food-safe. [24]
        Thanks
        Helpful 0 Not Helpful 0
      • 2-part molds will be more durable than molds made from construction silicone. This is because they are made using professional casting materials.
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        Helpful 9 Not Helpful 1
      • Silicone molds will not last forever; they will eventually degrade.
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      Warnings

      • Avoid touching construction silicone with your hands. It can irritate your skin.
        Thanks
        Helpful 22 Not Helpful 3
      • Construction silicone can produce fumes. Ensure that the area you are working in has good ventilation.
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        Helpful 0 Not Helpful 0
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      Things You'll Need

      Using Silicone and Liquid Soap

      • Water
      • Liquid soap
      • Bowl
      • Item to mold
      • Plastic gloves
      • Construction silicon, caulk silicone, or silicone sealant

      Using Silicone and Cornstarch

      • Disposable container
      • Cornstarch or cornflour
      • Item to mold
      • Plastic gloves
      • Construction silicon, caulk silicone, or silicone sealant

      Using 2-Part Silicone

      • 2-part silicone kit
      • Disposable cup
      • Stir stick
      • Plastic food container
      • Craft blade
      • Packaging tape
      • Item to mold

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      References

      1. ↑ https://www.youtube.com/watch?v=pmO5VoB7QVg
      2. ↑ https://www.youtube.com/watch?v=pmO5VoB7QVg
      3. ↑ http://fallfordiy.com/blog/2014/04/27/how-to-make-a-silicone-mould/
      4. ↑ http://www.myheap.com/casting-molding/my-heap-mold-book/chapter-8-silicone-caulk-molds.html
      5. ↑ https://www.youtube.com/watch?v=pmO5VoB7QVg
      6. ↑ https://www.madebybarb.com/2016/07/19/make-a-mold-for-concrete-part-1/
      7. ↑ http://fallfordiy.com/blog/2014/04/27/how-to-make-a-silicone-mould/
      8. ↑ https://www.youtube.com/watch?v=pmO5VoB7QVg
      9. ↑ http://fallfordiy.com/blog/2014/04/27/how-to-make-a-silicone-mould/
      1. ↑ https://www.youtube.com/watch?v=pmO5VoB7QVg
      2. ↑ https://www.youtube.com/watch?v=50AkrE1s9Iw
      3. ↑ https://www.madebybarb.com/2016/07/19/make-a-mold-for-concrete-part-1/
      4. ↑ https://www.youtube.com/watch?v=50AkrE1s9Iw
      5. ↑ https://www.youtube.com/watch?v=50AkrE1s9Iw
      6. ↑ https://www.youtube.com/watch?v=50AkrE1s9Iw
      7. ↑ https://www.youtube.com/watch?v=50AkrE1s9Iw
      8. ↑ https://www.youtube.com/watch?v=50AkrE1s9Iw
      9. ↑ https://www.youtube.com/watch?v=50AkrE1s9Iw
      10. ↑ https://www.youtube.com/watch?v=i_NMFz5ards
      11. ↑ https://www.youtube.com/watch?v=i_NMFz5ards
      12. ↑ https://www.youtube.com/watch?v=i_NMFz5ards
      13. ↑ https://www.youtube.com/watch?v=i_NMFz5ards
      14. ↑ https://www.youtube.com/watch?v=i_NMFz5ards
      15. ↑ https://www.madebybarb.com/2016/07/19/make-a-mold-for-concrete-part-1/

      About This Article

      Article Summary X

      To make a silicone mold, first mix 10 parts water and 1 part liquid soap in a large bowl. Then, squeeze enough 100% construction silicone into the bowl to cover the item you want to make a mold of. Put on latex gloves and knead the silicone in the water until it’s no longer sticky, about 5 minutes. Now roll the silicone into a ball and press it into a thick disc on a hard surface. Press your item face-down into the silicone, then let the silicone harden for a few hours. Finally, remove the item from the mold. Use your mold to make clay or resin decorations. Construction silicone isn’t food safe, so avoid using your mold for cooking or baking. If you want to learn how to use cornstarch or 2-part silicone for your mold, keep reading!

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        May 18, 2023

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