I also bought some by mistake but decided to use it on a wall hanging. I was sort of afraid it wouldnt' iron on smoothly so I laid it out on the table and pinned about 6-8 inches apart then I took it and ironed taking the pins out as I ironed. It was ok-I think you're supposed to be able to do it without pinning first but how would you make sure it was flat? I can't see doing anything large. Hopefully someone else has a better answer than mine. Maybe if you could iron on the floor or very large table you could do a whole quilt--I couldn't.