How to make a silicone mold for resin or polymer clay

How to make a silicone moldIf you’ve been wondering how to make a silicone mold, you will love this project. Here are the easy steps to creating a silicone mold with two-part silicone mold putty. Two-part silicone mold putty is easy to use because you don’t need fancy equipment to measure it to make a mold. You can also have a ready to use mold in 30 minutes!

Step 1: Prepare your work surface

Make sure your working surface is clean.  Cover it with a wax paper sheet, then tape it in place so it won’t move.

Step 2: Get everything ready

Once you start mixing the mold putty, you need to be ready to use it. That means having the item(s) you are going to mold prepared as well. Be sure they are clean and free of any grease or dirt before using them to make the mold.

Step 3: Measure and mix the putty

This putty mixes one-part A with one-part B. You can ‘eyeball’ equal amounts of the putty to mix it. You can also measure the parts by weight if you have a scale.

Once the two parts are measured, smash them together until they are evenly mixed. This takes about 1 minute. The putty is mixed when the color is even throughout and you don’t see any streaks.

You only need to mix enough molding putty to cover and surround the item you were molding. I usually only mold one thing at a time instead of mixing a bigger batch for a few items.

Step 4: Press the putty around your model

Once the putty is thoroughly mixed, roll it into a ball bigger than your model. Flatten the ball slightly, then place your model into the flattened area. Roll the putty over the object until the item is covered, pushing in somewhat on the sides and corners.

Don’t push too hard. You want to make sure to leave putty at least half to three-quarters inches thick around all sides, or it could rip easily later.

Pro tip: Use a Popsicle stick to push on the sides and flatten the bottom of the mold. This will allow it to sit evenly when you pour resin into it.

Work quickly, as you only have approximately two minutes to mold the putty around your mold once mixing is complete. After that, the mold will not be workable anymore.

Set the mold putty aside to cure for 30 minutes.

Step 5: Demold

Remove your model from the mold by pushing on the sides to loosen the item from the mold walls. After a few pushes, your model should pop out easily.

Your mold is now ready for polymer clay and epoxy resin projects. The molds are also great for soap or candle making. You can also use molds made with this particular brand of mold putty for making food projects like chocolates, candies, and ice cubes.

Want more help on how to make a silicone mold?  This video, courtesy of Meredith of Cosmic Designs shows you how to make a simple silicone mold ready to use in 30 minutes.



You can also see how to use two-part silicone putty to make a lego mold.

Ready to craft with resin but worried about making mistakes?  Already tried it and convinced it doesn’t work?  I’ve been there.  I made so many mistakes when I started, I wondered if I would ever make anything I could proudly show off.  It’s why I wrote the book, Resin Fundamentals.  I’ve taken my fourteen years of resin experience and condensed it into an ebook you can read this afternoon to get you from confused to confident with resin.  It’s the book I wish I had when I first started creating with resin!  Buy the book now and you can download it in minutes.

Unpublished Blog Posts of Resin Obsession, LLC © 2021 Resin Obsession, LLC

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7 thoughts on “How to make a silicone mold for resin or polymer clay

  1. I learned a new technique from you. Your mold is really good. I like how you drop your putty ontop of your item. I was going the wrong way.

  2. I was going the other way too! I must try it your way, looks like you will get a better impression and mold… Thanks so much for sharing

  3. I really like how you did this but is there a way to make a mold of something you dont physically have? I want to make Kida’s necklace from Disney’s Atlantis only I dont have the physical shape of the crystal to mold with. How should I go about it?

  4. Cam,

    You can’t make a mold of something without a physical model. What I would recommend in this case is to find a wax carver (we can hook you up with one) to carve a model for you. You can then make a silicone mold from this wax model.

  5. Cam – It’s totally possible to make a mold without having a physical object. All you need is a 3D modeling program like Maya or Zbrush for your computer and enough skill in using it to create a 3D render of the object. Considering the simplicity of the crystal, it should only take about 30 minutes. Once the 3D render is complete, invert it. Then send the file to a place like Shapeways that does 3D printing. You can have a perfectly detailed mold delivered to you and ready for use within a couple days.

  6. I have a plaster (I think its plaster) of a sailing ship. It’s approx 22 inches tall, 18 inches wide and the highest point is approx 1 inch. It has some intricate details and the back of it is flat.

    I would like to make a silicone mold or other material that is suitable for epoxy resin. I want to make an export resin of this piece in other words

    I’m a total newbie with molds. Any pointers?

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