Nothing you add to Super Sculpey (a polymer clay) will make it suitable for firing in a ceramics kiln, if that's what you're asking. Most polymer clay likes to be baked at about 225 degrees, not much more. As far as getting a durable piece, make sure you are baking it at the correct temperature, and bake it for a little longer. Make sure you let it cool completely afterwards before handling it. Otherwise, using an armature (supports like wire or dowels) can help support your piece. You may want to try a different brand if you still have trouble.
Sorry i have no clue
Can't help you there, i use a geat fiber clay..air dries..and is super hard
I guess I would need to know exactly what problem you're trying to solve the super sculpture clay itself doesn't need anything added to it to make it stronger it's very strong
If you are referring to Polymer clay, and not ceramic clay, then you might need to bake your pieces a bit longer, given the clay is properly conditioned. If you are at a high altitude like I am, I usually bake them an extra 10-20 minutes (be careful with translucent clay, baking too long will make it opaque). Try experimenting with different baking times. Do NOT change the temperature from what is on the package. You can also coat them with acrylic coat after or use liquid polymer clay to coat them before baking. Always bake on a polymer clay baking sheet or over bury them in cornstarch in deep bakeware. You can reuse the cornstarch. If you are referring to ceramic clay, then I would add grog to your clay. You may be able to find out what kind is already in it from the MSDS and add more of it.
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