I tape my backing down. I have used the floor, but the last two I've taken to church and used several tables pushed together or a ping pong table. I've never had a wrinkle on the back. I'm going to try taping the top down, too, on the next one. The one I'm finishing was very bias and had several places that could have had a wrinkle on the top. I'm not very satified with it. Tape, tape, tape and lots of pins.