Baking polymer clay phone case I've been trying to make a polymer clay cover for my phone case and have been having a horrible time.

The baking directions say 275 but the plastic is melting and warping the case. I want it to be strong on there, so I thought baking directly on it would help. Also with Bake &amp; Bond Sculpey to hold it to the case. Any suggestions to make this work?

I'm using "Premo".
Premo is one of the stronger kinds, so you're making the right choice there. I have only recently started using premo mixed my older sculpey III and have found it can cure as low as 225, but you'll obviously have to bake longer.