How To Guide

How to Bake Polymer Clay: A Comprehensive Guide

Polymer clay is a versatile, easy-to-use material favored by artists, crafters, and hobbyists. One of the key steps to working with polymer clay is baking, which hardens the clay and makes it more durable.

This comprehensive guide will explore everything you need to know about baking polymer clay, including essential materials, preparation, baking temperatures, safety precautions, and troubleshooting tips. By the end of this guide, you’ll be well-equipped to bake your polymer clay creations to perfection.

Copyright © 2013 by Ginger Davis Allman The Blue Bottle Tree, all rights reserved.

Essential Materials and Tools for Baking Polymer Clay

Polymer Clay

To begin, you’ll need polymer clay. Polymer clay is a synthetic modeling material made from polyvinyl chloride (PVC) and plasticizers. It is available in various colors and brands, including Fimo, Sculpey, and Premo. Each brand has unique characteristics, so choose one that suits your project requirements.


A dedicated oven or toaster oven is recommended for baking polymer clay. Using a separate oven ensures that there is no cross-contamination between the clay and food. However, if you must use your kitchen oven, make sure to clean it thoroughly before and after baking the clay.

Oven Thermometer

An oven thermometer ensures accurate temperature control when baking polymer clay. Inaccurate oven temperatures can result in underbaked or overbaked clay, leading to potential problems with your finished piece.

Baking Surface

A ceramic tile, glass baking dish, or oven-safe metal tray can be a baking surface for your polymer clay pieces. Avoid using surfaces with a non-stick coating, as they can react negatively with the clay.

Parchment Paper or Aluminum Foil

To prevent your clay pieces from sticking to the baking surface, use parchment paper or aluminum foil as a protective layer between the clay and the surface.

Heat-Resistant Gloves or Oven Mitts

To safely handle your baked polymer clay pieces, invest in a pair of heat-resistant gloves or oven mitts.

How to Prepare Polymer Clay for Baking

Conditioning the Clay

Before shaping and baking your polymer clay, it’s essential to condition it properly. Conditioning is the process of warming and softening the clay by kneading and rolling it. This process ensures that the clay is pliable, workable, and free of air bubbles, which can cause cracks during baking.

Shaping Your Clay

Once your polymer clay is conditioned, you can shape it into your desired form. Use your hands, clay tools, or molds to create your design. Remember that thinner pieces may bake more quickly than thicker ones, so try to maintain a consistent thickness throughout your piece.

Smooth Out Imperfections

Before baking, take the time to smooth out any imperfections in your polymer clay piece. Fingerprints, tool marks, and other blemishes can become more prominent after baking. Use your fingers, a damp cloth, or rubbing alcohol to gently smooth the surface of your clay.

Preparing Your Baking Surface

Prepare your baking surface by laying down a parchment paper or aluminum foil sheet. This layer will help prevent your polymer clay from sticking to the baking surface during the baking process.

Baking Polymer Clay: Temperature, Time, and Techniques

Setting the Oven Temperature

It’s essential to set the correct oven temperature for baking polymer clay. Different brands of polymer clay have specific baking temperature recommendations, typically ranging from 230°F (110°C) to 300°F (150°C). Consult the manufacturer’s instructions for the appropriate temperature for your chosen clay.

Before placing your polymer clay pieces in the oven, make sure to preheat it to the recommended temperature. Preheating ensures that the oven is stable when you start baking your clay, which helps prevent underbaking or overbaking.

Baking Time

The baking time for polymer clay depends on the thickness of your piece and the specific brand of clay you’re using. Generally, you should bake your polymer clay for 15 to 30 minutes per 1/4 inch (6mm) of thickness. Follow the manufacturer’s guidelines for the recommended baking time for your chosen clay.

Baking Techniques

To ensure even baking and prevent scorching or discoloration, follow these baking techniques:

  • Tenting: Cover your polymer clay pieces with an aluminum foil tent to protect them from direct heat and minimize the risk of scorching.
  • Support: Use polyester fiberfill or paper towels to support delicate or intricate polymer clay pieces during baking. This method helps maintain the shape of your piece and prevents sagging or distortion.
  • Baking on a Bed of Cornstarch: Some artists recommend baking polymer clay on a bed of cornstarch to provide additional support and prevent shiny spots on the clay’s surface.

Cooling Your Polymer Clay

After the baking time is complete, remove your polymer clay pieces from the oven using heat-resistant gloves or oven mitts. Allow the clay to cool completely on the baking surface before handling or attempting any further work. Cooling the clay ensures it has fully hardened and reached its maximum strength.

Safety Precautions and Tips for Baking Polymer Clay


Ensure proper ventilation in your workspace when baking polymer clay. Open windows or use an exhaust fan to remove any fumes that may be released during baking.

Avoid Overbaking or Underbaking

Overbaking polymer clay can result in discoloration, brittleness, or even burning. Underbaking, on the other hand, can leave your clay piece weak and susceptible to breaking. To prevent these issues, follow the manufacturer’s guidelines for baking temperature and time closely, and use an oven thermometer to monitor the oven’s temperature.

Food Safety

Avoid using the same oven, baking surfaces, or utensils for polymer clay and food preparation. Cross-contamination between clay and food can pose potential health risks. If you must use your kitchen oven for baking polymer clay, clean it thoroughly before and after baking it to prevent contamination.

Troubleshooting Common Issues with Baking Polymer Clay


Cracking in polymer clay pieces can be caused by air bubbles, uneven thickness, or rapid temperature changes during baking. To prevent cracking, make sure to condition your clay thoroughly, maintain consistent thickness throughout your piece, and preheat your oven before baking.

Discoloration or Scorching

Discoloration or scorching can occur if your polymer clay is baked at too high a temperature or too long. To avoid this issue, follow the manufacturer’s baking temperature and time guidelines, and use an oven thermometer to ensure accurate temperature control.

Brittle or Weak Clay

It may be underbaked if your baked polymer clay piece is brittle or weak. To remedy this issue, return the piece to the oven and bake for an additional 5 to 10 minutes, checking for doneness periodically.


Baking polymer clay is crucial in creating beautiful, durable artwork and crafts. By understanding the materials, tools, and techniques involved in baking polymer clay, you can ensure the success of your projects. Remember to follow the manufacturer’s guidelines for baking temperature and time, use an oven thermometer for accurate temperature control, and practice proper safety precautions. With patience and practice, you’ll soon be an expert in baking polymer clay.

Frequently Asked Questions (FAQs)

Can you bake polymer clay in a regular oven?

Yes, you can bake polymer clay in a regular oven. In fact, a conventional oven or a toaster oven is recommended for baking polymer clay. Just make sure to follow the manufacturer’s instructions for temperature and baking time, and use an oven thermometer for accurate temperature control.

Can I bake polymer clay on parchment paper?

Yes, you can bake polymer clay on parchment paper. Parchment paper is a suitable surface for baking polymer clay, as it prevents the clay from sticking to the baking tray and allows for easy removal once the clay has been baked. Alternatively, you can use a silicone baking mat or a ceramic tile.

Do you bake polymer clay or let it dry?

Polymer clay needs to be baked to harden and cure properly. Unlike air-dry clay, polymer clay will not harden or set by simply being left to dry. Baking polymer clay according to the manufacturer’s instructions is essential to ensure your creations are durable and long-lasting.

Can I bake polymer clay multiple times?

Yes, you can bake polymer clay multiple times. This technique is useful when creating complex or multi-layered pieces. Ensure each layer is fully cooled before adding the next layer and baking again.

Can I paint my polymer clay piece after baking?

Yes, you can paint your polymer clay piece after it has been baked and cooled. Acrylic paints are recommended for painting polymer clay, as they adhere well to the surface and offer a wide range of colors. To ensure the best results, clean your clay piece with rubbing alcohol before painting, and seal the paint with a clear varnish or sealant after it has dried.

Can I use a microwave or air fryer to bake polymer clay?

Using a microwave or air fryer to bake polymer clay is not recommended. These appliances do not provide the consistent temperature control required for successful polymer clay baking. Stick to using a conventional oven or toaster oven for the best results.

How can I tell if my polymer clay is fully baked?

To determine if your polymer clay piece is fully baked, gently press on the surface of the clay with the back of a spoon or your fingernail. It is likely fully baked if the clay feels slightly firm but still has a bit of give. If the clay feels soft or easily indents, it may require additional baking time.

Can I use polymer clay with food-safe molds or cookie cutters?

While you can use food-safe molds or cookie cutters with polymer clay, it is essential to designate those tools for clay use only and not use them for food preparation again. Cross-contamination between clay and food can pose potential health risks.

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