I've watched many youtube videos now about using EVA foam and I have to say "omg! where's this been my whole life?!" this is awesome. Most of the videos show some application of the foam being cut to fit a basic shape and then heated to bend it into a curved form. I even saw a member here that created a body cast of herself and bent the foam over the body cast to acheive the correct shape. My question is this: If I'm making a mask which has more complicated curves than simply bending, could I create a positive and negative mold and press the foam between it? Would air-dry clay be sufficient for the mold or would i need something stronger so I could press upon it with more weight? Using this method I'd only really have one application of heat. Would that be enough such that keeping it pressed in the mold would complete the process?