I saw on a video, for laying in the backing on a quilting frame, that if you spray mist with water, the wrinkles will fall out. It's TRUE! I now don't iron any backings unless they have the factory type of hard crease. I lay the backing across my quilting frame, spray (more spray for more wrinkles) and wait an hour (in cold weather - less time in hot weather), and the wrinkles literally fall out. I don't know why that wouldn't work for you!!!!