Bake Time
38 min
Temperature
275°F
Minimum
30 min
Pieces
1
Bake time stays the same for multiple pieces at the same thickness
Recommended Bake Time
38 min
at 275°F (135°C)
Minimum Time
30 min
Temperature
275°F
Burned or discolored?
Temperature too high. Check with an oven thermometer and reduce by 10°F.
Brittle or breaks easily?
Underbaked. Rebake at the correct temperature for another 15–20 minutes.
Bubbles or bumps?
Trapped air from conditioning. Flatten and fold more carefully, or poke bubbles before baking.
Inputs
Result
Thickness 0.5" ÷ 0.25 = 2 quarter inches. Premo bakes 30 min per ¼", so 2 × 30 = 60 min minimum. Recommended: 60 × 1.25 = 75 min.
Inputs
Result
Thickness 1.0" ÷ 0.25 = 4 quarter inches. Fimo Soft bakes 30 min per ¼", so 4 × 30 = 120 min minimum. Recommended: 120 × 1.25 = 150 min.
Inputs
Result
Max temp = 275°F (Sculpey III). Max time per ¼" = 30 min (Fimo Soft). 1 × 30 = 30 min minimum. Recommended: 30 × 1.25 = 37.5, rounded to 38 min.
Bake time depends on brand and thickness. Most brands require 15–30 minutes per ¼ inch of thickness. A ½-inch Premo piece needs 60 minutes minimum. Always bake longer rather than shorter for stronger results.
| Brand | Temp (°F) | Min per ¼" | Time at ½" |
|---|---|---|---|
| Original Sculpey | 275 | 15 min | 30 min |
| Premo! Sculpey | 275 | 30 min | 60 min |
| Fimo Soft | 230 | 30 min | 60 min |
| Kato Polyclay | 300 | 10 min | 20 min |
Each brand has a specific temperature printed on the packaging. Sculpey brands bake at 275°F (135°C), Fimo at 230°F (110°C), Cernit at 265°F (129°C), and Kato at 300°F (149°C). Never exceed the recommended temperature.
At the correct temperature, polymer clay cannot be overbaked — longer baking actually makes pieces stronger. Burning only happens when the temperature is too high. A piece baked for 2 hours at the right temp will be stronger than one baked for the minimum time.
Underbaked polymer clay is brittle and breaks easily. The polymer chains did not fully fuse during curing. You can re-bake underbaked pieces at the same temperature for additional time with no harm to the clay.
When mixing brands, use the highest baking temperature among the brands and the longest per-thickness time. For example, combining Sculpey III (275°F) with Fimo Soft (230°F), bake at 275°F. Fimo tolerates the higher temperature safely.
| Combination | Bake Temp | Time per ¼" |
|---|---|---|
| Sculpey + Fimo | 275°F | 30 min |
| Sculpey + Cernit | 275°F | 30 min |
| Fimo + Cernit | 265°F | 30 min |
| Any + Kato | 300°F | 30 min (test first) |
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Last Updated: Mar 9, 2026
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