Curing Polymer Clay


Curing Polymer Clay

Most polymer clays will harden and cure with the appropriate heat and length specified by the manufacturer. Polymer will be soft when first removed from the oven. Once cooled completely it will reach its final hardness. Fully cured polymer clay will be difficult to break. It is always a good idea to create and bake a small test strip before curing your final piece. Polymer clay can be cured in a conventional oven, toaster oven or portable convection oven. Using a small toaster oven may pose some issues as the clay should not be close to the heating element and may cause the clay to burn. All ovens may vary on temperature compared to the actual setting, we recommend using an oven thermometer to check the actual temperature before curing. Using two aluminum backing pans, along with binder clips to secure them together will help keep fumes inside the baking pan.

Watch our video below on baking polymer clay to learn more.

Curing Instructions for the Brands We Carry


Fimo Soft, Fimo Effect and Fimo Professional use the same curing temperature and duration. 230°F / 110°C for 30 minutes.


Cernit polymer clay can be baked several times. If after finishing you want to add decorative elements or other forms, the total piece can be placed again in the oven with the new elements.

Bake for 30 minutes at 230-266°F (110-130°C) in a preheated oven.


Sculpey III, Primo, Primo Accents and Professional use the same curing temperature and duration. 275°F / 130°C for 15 minutes per 1/4" (6mm) of thickness.