April 27, 2014

How to Make a Silicone Mould

Fall For DIY How to Make a Silicone Mould

Working on getting the new site up and running has meant I have neglected my ‘How to’ series. But we’re back with probably one of my favourite tutorials that has so much potential. This DIY is something I’ve been working on for ages! Being able to quickly and easily make a mould means I can make clay, resin and concrete (to name a few) versions of pretty much anything I like… Think of the possibilities!

So, like I say I have been working on this for a long time. The idea originally came from this post, which was awesome but I found it a was lacking a few key details so I recreated it here. I tried several different materials, techniques and combinations so some of the details in the pictures may change – so read through carefully!


Silicone Sealant – So this is important. It has to say silicone on it! I tried with different sealants and some worked… some really did not. The one in the picture below worked ok, but the best I tried was a “bathroom silicone sealant” which produced the final mould.

Caulking gun – to get the silicone out.

Hand soap

A positive to make the mould out of

bowl or bucket that isn’t used for food (because you’re not going to want to eat of of it again!)

Fall For DIY How to Make a Silicone Mould tutorial


1. Mix your soap and water together. I’ve done it roughly about 1 part soap to 10 parts water.

Whoa! We’ve changed soap colour here. This tutorial took a few times to get right, so we now have purple soap for the rest of the DIY. Like magic!

Fall For DIY tutorial How to Make a Silicone Mould

2. Cut the end off the silicone and without using the nozzle squeeze it all out using the calking gun. If you’re making a small mould you can just use a little and save the rest for another time.

3. Work the silicone until it is not sticky. I used both my hands to pull and squeeze the silicone whilst it was submerged in the water for about 5 minutes.

4. Keeping it wet transfer into a container. This step was not in the original tutorial but as the silicone drys it gets very sticky so you want it somewhere it won’t make a huge mess! The soapy water keeps stops it from sticking to your hands so don’t dry them yet either.

How to Make a Silicone Mould tutorial Fall For DIY

5. Press your object into the silicone to create the mould. You’ll want something with smooth edges that the silicone will peal off easily. This resin bracelet was perfect.

6. Leave the object in your resin until the mould is firm. This doesn’t take very long. Mine was set in just a couple of hours! Carefully peel the object out of the mould and the mould out of the container (so you can use it again!)

You might be wondering why I needed to make a silicone mould of a bracelet that I just made from a mould I already have…. right? Silicone moulds are ace for different materials and I needed something more flexible for a very special tutorial I’ll be able to share really soon with you! In the mean time I’ll probably be making moulds of everything I can think of, so expect to see more of this!

Fall For DIY tutorial How to make a mould

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60 thoughts on “How to Make a Silicone Mould

  1. Sandra

    Hey, do you think this will work for candle molds? I’d really appreciate your response, thanks for a great tutorial!

    1. fran Post author

      I don’t see why not, but I haven’t tested the silicone with heat myself yet. I might do a few experiments and come back to you to make sure.

      1. Kevin

        Most silicone handles up to 400 degrees quite easily. It should be fine. You just want to make sure you don’t have air pockets in the mold that may expand at a different ratio.

  2. Alicia

    This looks awesome, but I’ve got a couple of questions: Do you leave the object in the silicone until it dries, or take it out immediately? Also, how long does the silicone take to set up?


    1. fran Post author

      Hi Alicia! I completely forgot to put these details in the post. Thanks for reminding me! Leave the object in the silicone. It’s easy to remove once the silicone is set, which only takes about 1-2 hours. Really quick!

    1. fran Post author

      Hi Helen,

      I didn’t coat the bracelet, but as it was resin it has a nice shiny outer layer anyway. Plastics and other hard shiny surfaces should be ok as well. I imagine any surfaces that might be porous like fabric or wood might need a layer of glue or vaseline over the top. I’ll be experimenting loads with this technique so I’ll see what I can find out!

      Thanks for your question!

      1. Patrick R

        Just don’t try to make a mould of a silicone object. Silicone doesn’t play well with silicone!

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  5. Catollie

    just wondering what materials could be used as a food grade source.
    buying molding kits for fondant etc. are expensive. but some of those molds are also silicone. or even using the rubber dip that you can find have you tried that as a molding source? TIA

    1. Eve

      Hi Catolie,

      For food grade silicon, I am using Amazing mold putty. You can buy it easily online. It is working well with fondant, resin, clay and you can bake it.

      Have fun :-)

    2. fran Post author


      I’m pretty sure you can’t use this silicone with food items. The smell alone is a bit chemically. I have also bought silicone molds for fondant, but I’m afraid I don’t know how you can make a safe mold for food. Have you tried pressing shapes into compact brown sugar and using this as a mold?

  6. Jessica

    you can also use silicone sealant and cornstarch.. dump cornstarch on a smooth surface.. the pump out the silicone sealant, enough for what ever you need to mold. knead the cornstarch into the silicone adding cornstarch as needed and work it until it isn’t sticky. lightly coat whatever your going to mold with petroleum jelly or spray lightly with cooking spray and press into the silicon and leave to dry/cure. it works for lots of small things such as pendents for jewelry etc.

    1. Annette

      The silicone needs to state on the packaging that it is paintable otherwise the paint won’t stick.

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  8. Tony

    One quick comment to piggy-back on something that was already said. Do NOT use kitchen or bathroom silicon sealant for anything that will touch food related items. These sealants have chemicals to prevent the growth of mold (like cyanide!! YIKES!) mixed into them.

    1. fran Post author

      Thanks for clearing that up Tony. Definitely don’t want those things to be touching food! Also probably wise to wash your hands well after you’ve been making/using the mold as well.

      1. Lucinda Price

        If you use nitrile exam gloves (like the kind that are used in medical clinics now in place of latex), that will protect you from the chemicals you might be exposed to if you handle the sealant for extended periods of time. :-)

  9. Florence

    Thanks for this. I have been looking for something to use to make a dolls head mold. I live on a mountain miles from anywhere and find it hard to get supplies but I can buy silicon from the local butchers!!
    Will give it a go :)

  10. Kelly

    There is a silicone that is heat resistant, we had to use it when we installed our pellet stove. This is such a great idea. Thanks for sharing!!!

    1. fran Post author

      Hey Kelly! Thanks for that pearl of wisdom. Heat resistant silicone would be perfect for candle making… the options are endless! :)

  11. Pat Simcox

    Hi, this sounds fabulous !! Would the moulds work with polymer clay do you think ?? Also are they flexible when they set so you can get the object out easily ?? Thank you.

    1. fran Post author

      Hey Pat,
      Yes! I’ve used them myself with polymer clay. They work brilliantly. The reason I wanted to make silicone moulds is for making objects out of concrete. I needed something flexible to keep the concrete intact when I was releasing it. These moulds are perfect for that requirement. I have also popped the mould, with clay set inside, in the freezer for half an hour to make it even easier to get the clay out before heating. Works a treat. Hope that helps!

  12. Silver Otter

    I have been wanting to restore an old mirror with plaster framing there are several places where the plaster has been broken off it was always one of those how can i do it projects. now i know i’ll make a mold of a good section . then pour plaster into that and glue the dried product to the mirror then paint and gild it. Won’t my friend mate be surprised when i restore her special floor length oval mirror. She asked me years old to fix it now i can. thanks

    1. fran Post author

      I have never made soaps, but I think it would. That’s something I’d really love to do… I’m going to do some research!

  13. Marge

    Jaclyn – Pewter melts at 340-450 degrees. If your silicone is good to only 400 you might have a problem, but if you find some that is for heat resistant , like Kelly mentioned.

    1. Diana

      Well, from everything I have read, why not use a silicone mold to make a cement mold, then use the new cement mold for the pewter casting …. just a thought

      1. fran Post author

        Thanks Diana! These are all processes you can do easily at home. If anyone tries this out I’d love to see the results!

        1. Kzoo Kid

          Diana, the double-mold process works great. I’ve used it many times to make plaster molds for glass casting. The plaster molds are destroyed by heat needed to melt the glass, but the silicone mold they’re made from is good for many, many reuses.

          Fran, good tutorial, thanks. Gonna have to check out the rest of the site.

  14. karrie

    ive gotten all the stuff to try to make a couple molds for some buttons and maybe some pendants. how do you store your molds after youve made them?

    1. Kzoo Kid

      karrie, anywhere cool & dry will be fine. As long as the mold is completely cured, it won’t stick to a shelf or whatever you set it on. Any dusty bits that settle on it after a while can be rinsed off with plain water before using.

  15. farrah

    cest beau ce que vous faite etr je sai je suis tres interer de faire et de creer des modeles car je sui sure de faire mieu et meme plus mai jai pas les moyen de materiel sasserais tres reconnaissante pour la puit que vous me raporterais, mercie manque ces creation et ideé et model et nous avons bon acheteur,

    mon portable :00213698586348


  16. Emily S

    Just wondering whether anyone has attempted this tutorial for a two part mould and used anything like porcelain slip? I would really love to make ball jointed dolls, which means making two part slip moulds to achieve hollow body parts, but I can not bare the concept of the expense for a liquid silicon mould kit!

    The tutorial is fab by the way- I will find some use for it whether it is the above described or not, I have no doubt xD

    1. fran Post author

      Hey Emily,

      I have not tried anything like that. Hopefully someone might comment who can help maybe?
      Thanks for your lovely compliments about the tutorial though. I hope you fins it useful!


  17. Mary

    I wonder if this would work to make mold’s of leaves for doing concrete,etc. In the winter I have no leaves to work with,this would be great if it would work. What do you think?

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  20. karrie loughridge

    I am going to try this for making some molds outta of some buttons and maybe some pendants. what do you store your molds in after your done using them?

    1. fran Post author

      Hey Karrie,

      I love that idea of using buttons to make moulds. You could make some really interesting things out of those! I just throw my molds into a big box. As long as they don’t come into contact with any sharp objects they should be fine.

  21. Catalina

    Really nice tutorial! I have been trying to make molds for a while now and I bought some liquid silicone but it turned out to be to expensive and tedious. Do you think I could make a two faced mold for plaster with the example you just did? Im thinking of just covering my whole object and then just cutting out the silicone in half when is done. Or is the silicone to hard? thank you!

    1. fran Post author

      Hey Catalina,

      This silicone mold is perfect for this use. The silicone is soft and easily sliced with a craft knife. I have not tried it myself but I think you can definitely use this technique to make a two faced mold xx

  22. kristie

    Does this mold stay flexible so you can make a mold of a solid object can be fully incased with the silicone mold material can be crafter the material sets, with a razor blade directly down middle starting from one side and around to other side leaving bottom of mold untouched.

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