I don't iron it in half, after I sew on the binding I then iron it, then flip the binding onto the other side, glue and iron down. Makes the binding perfect for sewing.
Originally Posted by
Peckish
Different strokes for different folks. I found that when I stopped ironing, the binding snugged up to the top much better and laid flatter. I think that ironing sets a memory into the binding that doesn't allow it to move and shift as you wrap it around to the back, and then you end up with lumps.