How to Properly Bake Polymer Clay

Posted on January 22, 2013 in Hints, Tips, & Tricks by Katie


How to Bake Polymer Clay Tutorial on KatersAcres Blog

Helping You Learn How to Bake Polymer Clay

All you have to do is search the internet for help on how to bake polymer clay.  You will see a lot of wrong and incorrect instructions on how to do this.  But let’s be honest: every artist does this differently and every artist has their own system that works for them.  What works for me, may not work for you.  And the biggest thing with polymer clay … the baking times are different for almost every brand of clay and oven.  Today I’m going to give you a few tips on how to bake polymer clay items at home in your own toaster oven.

Read Your Polymer Clay Package

Premo Polymer Clay - How to Bake Polymer Clay on KatersAcres Blog http://katersacres.comThe first step is the most important, you must read the instructions on your package!  Every brand of polymer clay is different and has different specifications.  I chose Premo! by Sculpey here as my example because not only is that my preferred brand of polymer clay, but it is also a brand that many artists and crafters prefer.

Know Your Clay

Because every clay is different, you will also find that the same brand of clay can vary in baking times across colors.  What I mean by this is that many colors of clay (especially in the Premo! brand) will darken after baking; especially when baked at too high of a temperature.  And again, I can not stress this enough, follow the recommended time & temperatures for each package and brand of clay.

General Rule of Thumb

I mix my clays and brands all the time.  I mix Sculpey III, Fimo, or Super Sculpey with Premo! every day in my studio.  There’s no “magic formula” to finding what works for baking times as every oven, craft oven, and toaster oven is different.  As for me and all my sculptures, I bake all my pieces at 275 degrees for 45-60 minutes.  If my piece goes through several baking steps, I still bake my item at 275 degrees, but only for about 10 minutes for the first bake, just to “firm up” the clay.  Then I continue working on the piece and continue baking at the 10 minute increments.  However, for the final bake (when my piece has had multiple bakes) I only bake the piece for no less than an additional 45 minutes.

A Few Tips for You

How to Keep Clay from Burning

How to Bake Polymer Clay - Use Foil to Keep Your Items from Burning on KatersAcres Blog http://katersacres.comOne of the most common problems with polymer clay is the burning of the piece.  (I have written another article on this here, feel free to read it too).  I have on several occasions in the past, burned my sculpture … and it has not made me happy.  How and why did that happen? Because I let it in too long, or it was too close to the side walls / top of the oven and portions on the sculpture burned.  To keep this from happening, use foil sheets to cover your work.  These are the foil sheets that I have in my studio.  You can use them to cover most objects or attach two sheets together to cover a large object.  They can also be reused hundreds of times.  I still have one sheet that I reuse over and over and over again, it’s about a year old now.  This one box should last you at least a year, if not longer.  In addition and as a side note, I cover everything!  There is nothing that goes into my polymer clay oven that isn’t covered.  I work too long and too hard on my pieces to have accidental burning!

Stabilize Your Unpredictable Toaster Oven

How to Bake Polymer Clay - Oven Tips by KatersAcres http://katersacres.comIf you use a toaster oven, the oven is most likely highly unstable and prone to spikes in temperature.  When this happens, it will cause your polymer clay piece to crack.  And this is sad, very sad.  There’s an easy way to prevent this from happening.  At left is a picture of my toaster oven.  Take a look at what I’ve done to the inside of my oven, not only does it have an oven thermometer inside, but you will also see several varying sizes of ceramic tiles.  I purchased ceramic tiles at my local hardware store and bought them to fit the inside of my oven. This helps to act as an insulator to keep the oven at a more stable temperature.  I also have a 12×12 ceramic tile block (also from my local hardware store) sitting on the top vent of my oven, again to help insulate and keep the temperature stable.

Please take note, this is not my idea to use ceramic tiles in your oven.  I have seen this on several websites, blogs, and even floating around Pinterest.  I have no idea where this idea originated or who to give credit to, but, alas … it is not me.  But thank you for thinking that I’m actually that smart!

Thanks for joining me today,

Happy Claying,

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31 Comments for this entry
November 23, 2016

Any ideas in WHY my clay is MELTING instead of hardening??!!

November 26, 2016

Polymer clay should NOT melt, ever. Are you sure it’s polymer clay and not plastilina? Plastilina is right next to polymer clay in craft stores and is much cheaper. It is often confused for polymer clay.

Julie Cressler
August 14, 2016

Thank you so much for your great baking tips! It’s such a disappointment to burn something you have worked hard on. Lots of good info here, I enjoy your site.

August 15, 2016

You’re welcome. I’m glad you have found them useful.

Dorothy Manna
April 11, 2016

Would the Reynolds brand Wrapper foil sheets be OK to use on clay projects? Also, I have always baked my clay pieces on a tile placed on the center rack of my oven. Seems to work great, but at times the piece seems to slightly stick to the tile. Any suggestion? Really love your site and have learned so much from it. Thanks

April 11, 2016

Hi Dorothy! Thanks for visiting. You can use the wrapper foil sheets to COVER your clay, but do not set your clay on it to bake. In regard to your piece sticking to the tile, place a piece of printer paper on TOP of the tile, then place your project on top of the paper. The paper will not burn and your project will not stick. I hope this helps!

April 8, 2016

Never thought of the tiles in the toaster oven! Buying a few tomorrow. I just started working with polymer clay and hopefully this will help!

March 21, 2016

I have no idea clay can be baked. I thought clay is for the children to play. But now with help of your baking tips, I’ll try this.

March 22, 2016

Please check your clay Charlotte. Not all clays can be baked. This article was written for polymer clay. Polymer clay is different than air-dry clay or paper clay.

Deanna barnes
December 15, 2015

Hi! I love your tips and tutes!!! My question is regarding the ceramic tiles. You mentioned that you put one on top
…I was wondering if it on the top rack inside the oven on the top of the outside of the oven? Thanks so much for sharing your time and talents! 🙂

December 16, 2015

Hi there! I have a marble tile on the TOP (outside) of my toaster oven. It covers the vent to keep heat from escaping too fast and cooling the oven too quickly.

October 20, 2015

Here’s a weird question. I had not heard about the temp is better higher rather than lower so after crisping a few pieces have been cooking at a lower than normal temp for double the recommended time (like a good Texas brisket is cooked ). Thick pieces are coming out fine but thin, delicate are crumbling so easily. So here’s my question, can I rebake pieces for your recommended 45 minutes at clay recommended temp or are they lost cause?

October 20, 2015

Hi Jenifer! Thanks for asking. Polymer clay MUST be baked no LESS than the recommended temperature or it will be crumbly and brittle. Most brands of polymer clay are super strong after baking, when baked correctly. Your pieces could have been burning at the higher (recommended) temperature because they are 1) too close to the heating elements 2) your oven is spiking in temperature 3) you are mixing brands of clay that bake at substantially less temperature than others. I hope these tips help! Thanks for stopping by.

September 29, 2015

Terrific article. I appreciate your tip on multiple baking times. I wasn’t doing the 10 mins the first time, because I don’t often know that I’m going to be baking a 2nd or 3rd time in the beginning. I was nervous about doing a longer bake in the end after having baked for 30 minutes the 1st time, but to assure what was added on in the end, still needed to. I’m always careful how items are covered, no problems thus far.

Lynda Luna
May 28, 2015

I am new at working with polymer clay and I’m not sure if anyone has already asked this, but is it possible to make paper weights with polymer clay? If so, does the clay have to be flat or can it be in a large ball (about the size of a cupcake or softball)? Please let me know if this is possible and if I would need to change anything with the baking temperature or time. Thank you.

May 29, 2015

The possibilities with polymer clay are limitless. You can absolutely make paperweights. I would make an armature first. Then cover the armature with clay, bake, & you’re finished!

Lyn Boundy
March 8, 2015

May I ask a question here? I’m still very new to polymer clay and loving every minute but I still don’t seem to be able to get my baking consistently right. Because I find it hard to get a consistent temperature and was afraid of going too hot, I started out baking everything at probably a couple of degrees lower than ideal. Everything came out looking fine but I was afraid I might have problems down the line with brittleness so I asked a professional (I won’t name her) and she said it was better to bake at too high a temperature than too low and that my work wouldn’t burn as long as it was covered. She also said that she bakes for several hours regardless of size. Yesterday I tried to bake a piece that was about two inches at its thickest point. I baked it at around 264 degrees for 2.5 hours but it sill came out burnt and discoloured. Please can someone tell me what I am doing so wrong? Might it have made a difference that I checked the piece several times during baking (the burning happened at some time during the last hour and everything seemed okay up to that point)? I baked it on a ceramic tile with several pieces of paper under it and enclosed it in a disposable tin baking dish with another on top, the two of them held together with bulldog clips. Please can someone help as I am getting desperate! Thank you for reading.

March 10, 2015

Lyn – It sounds to me like your clay is too close to the heating element. The person who told you that it is better to bake at too high than low is exactly right. If you bake clay too low is it brittle and will not have the strength it is supposed to have. The only thing that would cause this kind of scorching is the clay being too close to the heating elements. You should have no less that 1/2″ clearance from each heating element. Additionally, covering your item would also help.


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February 9, 2014

Thankyou! Was looking for baking tips that actually stated temps in F• or C•


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Bev Allbright
July 18, 2013

Thanks so much for the tips. Until now I was afraid to bake my pieces multiple times. I can’t wait to try it out.


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January 25, 2013

Great tips Katie, I wasn’t aware that covering with foil helps and neither knew about the tile tip..Thank You !!
Yesterday night, I worked on two pieces for about 4 hours..from 9:30pm to 1:30 am..and burnt them in 10 mins:(
I had accidentally turned the temperature setting to 400F while moving the oven ! my clay pieces stood no chance against that! Its painful when it happens .So making sure our oven settings haven’t accidentally changed since you last used before baking the clay is also a good idea 🙂

January 22, 2013

I always cover with foil, too, since I have a rather small oven, but I did not know about the ceramic tile tip–thanks!

January 22, 2013

You are welcome! It’s been the single best thing that I have done to help control the heat and fluctuations of temperature.

Trina (Trina's Clay Creations)
January 22, 2013

Great baking tips here Katie, thanks for sharing!


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