Is there a name for those little dishes that have a curved inner that ive seen used for figures heads to keep the back rounded when applying pressure.
I know exactly what you mean but can't think of what they're called, but if not, could you maybe try a paint mixing tray? The ones with several little dips in them?
Or if not, is this what you mean?
Paint mixing trays? Google it under "images" and see if that is what you want.
I managed to find out 'former' its called