I machine sew the bindings and I haven't had any problems with waves. I press my binding in half, and then I machine sew it all the way around. I use the standard 2.5 to stitch it. Then I fold it over and press again ... then I pin - not a lot, just enough to keep it in place. When I sew it this time, I lengthen my stitches to 3.5 or 4, and I let my machine guide it.