If you’ve wondered how to make a silicone mold, the good news is that it’s easier than you might think.
All you need to use is two-part silicone mold putty.
Here’s why it’s THE BOMB to make a silicone mold:
✅ You don’t need any fancy equipment.
✅ Molds are food safe.
✅ You can 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 so it won’t move.
Step 2: Get everything ready.
Once you start mixing the mold putty, you must be ready to use it. That means having the items you’re molding ready as well. Be sure they’re clean and free of any grease or dirt. If you don’t, that will transfer to your silicone mold.
BONUS: If you aren’t sure what to use for your model, check out this mold-making article.
Step 3: Measure and mix the putty.
This putty mixes one part A with one-part B. You can ‘eyeball’ equal amounts of putty to mix it. You can also measure the parts by weight if you have a scale.
💡 Pro tip: It’s pretty forgiving when it comes to mixing. I’ve never used a scale to mix it and my silicone always cures perfectly.
Once you measure the two parts, smash them together until they are evenly mixed. This takes about 1 minute. The putty is mixed when the color is even throughout. You shouldn’t see any streaks.
You only need to mix enough molding putty to cover and surround the item you’re molding.
💡 Pro tip: 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 you’ve mixed your putty, 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 it’s covered, pushing in somewhat on the sides and corners.
Don’t push too hard. You want to leave putty at least half to three-quarters inches thick around all sides. If you don’t, it can rip later.
💡 Pro tip: Use a Popsicle stick to push on the sides and flatten the bottom of the mold. This lets your silicone mold sit level when you pour your epoxy resin into it.
Work quickly. You only have about two minutes to mold the putty around your model once mixed. After that, the silicone won’t be workable anymore.
Set your mold putty aside to cure for 30 minutes.
Step 5: Demold.
Remove your model from the mold by pushing the sides to loosen the template from the mold walls. After a few pushes, your model should pop out easily.
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. (And it’s ready to use in 30 minutes.)
You can also see how to use two-part silicone putty to make a lego mold.
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