Using a “Tile Sandwich” for Baking Flat Polymer Clay

Baking Flat Pieces In A Tile Sandwich - Polymer Clay TutorVideo #676: The trick to keeping those ugly bubbles and blemishes from showing up, is to sandwich in between two ceramic tiles.

Topics Covered In This Video:

  • How to bake flat polymer clay in a tile sandwich.
  • I received a question/request from another YouTuber called SweetBioDesign, for a way to bake flat pieces so that they don’t curl up after baking.
  • I also had this issue way back when I baked directly on a ceramic tile, where I’d get little bubbles on the top and weird gaps and shiny spots on the back of all my flat pieces.
  • So years and years ago, I started baking my clay pieces in between a ceramic tile sandwich.
  • You need two smooth ceramic tiles with no embossed patterns or textured surfaces.
  • The tile sandwich… place one tile smooth side up on the bottom. Then add a piece of plain office paper ontop of the tile. Then your flat polymer clay piece. Then another piece of paper. Then lastly, the other tile, smooth side down.
  • Bake tile sandwich in the oven for one hour… at the correct temperature for the brand of polymer clay that you are using.
  • The piece will come out perfectly flat and smooth on both sides.

Do you have any suggestions for videos on tips, techniques or products you would like to learn more about? Let me know in the comments section below!

My goal is to help you to learn quicker and easier ways to bring up the professionalism in your polymer clay art.

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Looking forward to hearing from you!

Cindy Lietz SignaturePolymer Clay Tutor
  1. Katy P, 15 June, 2015

    Thanks for the tip! I’ve always wondered how to get rid of the bubbles I sometimes get in my clay.

  2. landri w, 15 June, 2015

    This video was only a couple days late! I had just made a journal cover and I had problems with the pieces bending and getting bubbles.

  3. Kitty O, 15 June, 2015

    So much to learn. Thanx Cindy for your insights :)

  4. Krithika P, 16 June, 2015

    I found this tip in a discussion somewhere on this blog and I’ve been baking flat pieces like this for the past two weeks. This definitely helps with bubbles and preventing pieces from curling up. But I’m still seeing a weird sort of depression in the center of my flat pieces: like the center of a cake might sink, just a touch. This isn’t visible until I start sanding, and it takes so long to get the whole piece level. Does this happen to anyone else?!

  5. Cindy Lietz, 17 June, 2015

    Hi Krithika, make sure to stick your piece down to a piece of paper first before baking… this should help with that weird depression on the back.

  6. Krithika P, 17 June, 2015

    I do put the clay face down onto a piece of paper. I’m experimenting with using a bone folder to “burnish” the paper on the clay lightly before I put it between the tiles. I’ll see if that helps!
    Also, I use plain paper from a letter pad that’s a nice size for the tray and tiles I use. I notice they seem to get all wonky. I wonder if using stiffer card stock will help.

  7. Cindy Lietz, 18 June, 2015

    A stiffer card may work better for you. Let us know if it makes a difference.

  8. Dixie Ann, 16 June, 2015

    Hi Cindy, thanks for the recap on baking flat pieces. I was just getting ready to make a journal cover and texturize it with a couple of the Kor-Tools. Do I still want to bake it ala sandwich style after I have manipulated the clay sheet with a textured design or should I leave the top tile off? I have never tried this so I am concerned about any bubbles showing up on the backside with no weight on top.

  9. Cindy Lietz, 17 June, 2015

    Hi Dixie Ann, if you stick it down to the paper well with no air pockets you can bake without the top tile if you want. If you are still concerned, I would bake for about 10-15 miens without the tile, to set the pattern, then add the tile to bake the rest of the hour. That should help prevent bubbles without ruining your texture.

  10. Dixie Ann, 17 June, 2015

    Thanks Cindy, that sounds like a great idea. Also do you want a copy of my sales for the Jool Tool send to you. I purchased it several months ago. I can scan it as a PDF and email it to you if you wish. Let me know.

  11. Karen A, 19 June, 2015

    That was helpful! Actually I never realized baking a flat tile flat was a problem, but then I’ve never tried that particular event. However, one day I will . . . . Thanks

  12. Susan Higgins, 27 July, 2015


    I am covering tin boxes with sheets of polymer clay before decorating them and no matter how careful I am, I still get bubbles. On the one I backed today, I put a sheet of stock paper and then a tile on top but I still got bubbles. What am I doing wrong or other steps do I need to take to prevent bubbles.


  13. Bryanna Noel, 11 September, 2015

    Hi Cindy, I was just curious on the baking. I’m assuming baking with paper is not going to catch fire or anything? Also, usually I bake things at 275 for 15 minutes. It won’t burn if I back for an hour?

  14. Krithika P, 11 September, 2015

    Hi Bryanna,

    Paper won’t burn at the temperatures we use for clay. The clay will also not burn as long as you stick to 275. In any case, it’s better to bake the clay covered with a foil pan or paper tent of some kind. This way any fumes due to spikes will be contained. 15 minutes isn’t enough to make strong, durable pieces.

  15. Maretha Botes, 16 January, 2021

    I saw your informative video on the tile sandwich and I’m ready to try it! However, I’d first like to know do you roll your clay out on the paper, or do you roll it out on another surface, and then transfer it to the paper/tile sandwich? I have a problem transferring my flat objects to the tile. It either gets my fingerprints on it or it disfigures…At the moment I roll out and cut out all my pieces on a tile, and then bake it on the same tile so that I don’t need to lift or touch it again. BUT I do have the issue with bubbles and funky backs, that’s why I think your advice on the sandwich is a must-try!

  16. Cindy Lietz, 18 January, 2021

    Hi Maretha, if you are finding your clay gets fingerprints or distorted really badly, perhaps your clay is a little too soft? Firming up your clay a bit by leaching it, may help you. Just do a search at the top of the page for the word leach or leaching. It will take you to some posts on how to do that. (Scroll past the Google ads to see the blog posts.)

    You can also try putting a little cornstarch on the back of your clay to keep it from sticking to the surface. Or you could try rolling on paper, though don’t leave the clay sitting on paper for a long time or you will leach out too much of the oils and make the clay crumbly. (If you ever end up over leaching your clay you can always add a couple drops of clay softener to soften it back up again.)

    I generally just work on my glass cutting board and slide my clay blade under my piece to lift it off the surface. I also use a gentle touch and not press too hard that I leave fingerprints nor pull too hard that it distorts. Just be gentle when you’re working with the clay that will help a lot. Hope that helps!

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