At a quilt show in Shipshewana this man had a little wooden hammer he made with a rubber tip on it, then he showed us an area where you could see that a seem was sort of standing up......he placed a piece of white cloth over the seam and hit it with the hammer........afterwards that seam was so flat you could no longer see it or feel it........I bet if you took a rubber mallet and did the same thing it might work to flatten all the seams....worth a try....couldn't hurt it as long as you have fabric in between. Hope this helps