RE: What is the proper way to Iron Ultracote on top of Ultracote?
If you are doing small trim pieces I would use trim solvent or windex. Heat is very hard to control so as not to shrink pieces out of shape or distort the bottom layer. If you must use an iron I would practice with test settings on the iron until the adhesive just starts to melt when the top is heated for a second or so. Also make sure the bottom layer is shrunk sufficiently before adding the top layer.