From the Aves website,
How high of a temperature can Apoxie® Sculpt take? I am looking at an oven baked glaze product to get ceramic like results using Aves® products. It has to bake at 300 degrees F for 35 minutes.
We found a glaze that is oven baked, called ‘Pebeo Porcelaine’ 150 (comes in 47 different colors and it’s dishwasher safe, too) It worked on both Apoxie® Sculpt and on FIXIT® Of course, you can paint or otherwise finish Aves® products with nearly any coatings.
300 degrees is OK, it seems. Thats what the Pebeo Porcelaine calls for.
Edit:
Bake with polymer clays Yes! Apoxie® Sculpt is designed to withstand temperatures up to 350 degrees F. for best results we recommend allowing our product to cure before baking.