Originally Posted by
dunster
Yes, try blocking. However wavy edges usually mean that your borders are larger than they should be. Did you measure the quilt through the center and a couple of other places and cut your borders to size before attaching them?
Follow dunster's great advice, to measure carefully, and I have the best luck with borders if I sew them on with the border fabric on the bottom, and the quilt center face down on top. The way the feed dogs work, this also helps prevent ripples.