Bubbles in polymer clay are caused by trapped air. It usually happens when you condition your clay.
These tips will help you minimize the bubbles during polymer clay conditioning:
- Soft clay will trap more air bubbles, so try to leach out soft polymer clay as your first step.
- Tear the clay instead of folding. Every time you fold your clay, the air gets trapped inside. If you are using a pasta machine, slide the fold into the rollers first.
- You can remove air bubbles by popping them with a needle or blade and then flatten the clay. Stretching a sheet of clay helps release some air.
Remove air bubbles from the baked polymer clay with acetone. Dip a cotton swab in acetone and gently rub over the bump. Use this method on a test piece first, as acetone may change the color of your clay.