Absolutely you can! Many artists producing larger clay creations use paper mache all the time, particularly in projects that require a hollow form. However, there are some things to consider, and important steps, to create a successful and safe project.
- The paper mache base creation should be multiple layers thick, using a bonding agent that will not adversely react to heat. By adversely, I mean release toxic gas or burst into flame. Personally, I use wheat paste for these types of projects.
- Don’t use tape in your paper mache base.
- The paper mache base MUST be completely dry before wrapping in clay or sealing. This isn’t just a polymer clay specific requirement, but is extra important considering it will be baked or wrapped in polymer clay. If it’s still wet it can cause steam, or if it is entirely encased in clay, there is a chance it could explode due to pressure. Also, paper mache will slightly shrink, barely noticeably usually, but even a slight different in the polymer clay casing and the paper mache base can cause structure problems. Drying completly before sealing also avoids issues with mold, but that isn’t a problem when baking it.
- Make sure your clay is at least 1/4″ thick.
- If you’re going to cut holes in the clay part of your project, cut before baking. If you’re going to cut holes in the paper mache part of your project, cut after baking. Do it in that order to avoid a variety of issues.
- Sealant Tips!
- If you choose to seal pre-baking, make sure the sealant is safe to use in heat, don’t release bad chemicals into your food oven.
- Make sure the the sealant will not adversely react with the polymer clay, think water based.
- If the paper mache base is entirely encapsulated by polymer clay, the sealant isn’t required since it is basically sealed with clay.
- You can seal post-baking, especially if you plan on sealing to protect the clay as well.
- It is important to seal any bare paper mache, because, after all, it is paper. And paper becomes very structurally unsound with water or moisture. Also bugs like paper for food, and if you use wheat paste like I do, your projects come marinated.
- Temperature and time are the trickiest part of this pairing, as you want to use the lowest possible temperature. Do your own research for the lowest temp your clay will do, as it is dependent on the type of polymer clay you use. I can say that most clay with bind as long as the temperature is over 220°F. Depending on thickness and size, this can require a time of 30+ minutes. You also want to place your tray with your creation in the oven farthest from the heat source. Obviously, keep an eye on it just in case.
If you’re still hesitant on baking polymer clay on paper mache, don’t worry! There are alternatives! You can always use aluminium foil in place of paper mache, and bake the clay as usual. You can also use an air dry, like a store bought paper clay or following our own DIY air dry clay recipes.
Happy Crafting!