I didn't set out to iron my batting, just to smooth some spots in the border before I added the binding. The Hobbs melted together slightly. No harm done, just a less than fluffy corner. I have pressed a very wrinkled poly batt, but I knew I was pressing batting, so I didn't have the iron on too high and I didn't set it all the way down. I like 80/20 okay if I preshrink it. Can you tell I'm the weirdo who isn't after the old fashioned look?