Polymer clay becomes hard and solid through the baking process, so there is no need to take additional steps to harden it after baking.
Steps to ensure proper polymer clay hardness:
- Conditioning: Properly condition the clay before shaping and baking to ensure even curing.
- Baking Temperature: Follow the recommended baking temperature and duration provided by the manufacturer.
- Cooling: Allow the clay to cool completely after baking to achieve its final hardness and durability.
Attempting to re-bake polymer clay after it has already been cured can lead to over-baking and potential damage to your creations.