Anyone know about this, what materials to use and how it all works. Ideally I am looking to make a fairly flattish shape from the inside of a cast then dry out, paint and stick onto a piece of card stock. Like a map with geographical contours. How do I do this. I understand this might not be the best place to ask this, just an idea I just had about something I am going to do. I've never really worked with materials artistically, not since I was in school.