you're welcome quiltingbuddy. I cut my batting in a straight line as in the video I have never tried a wavy cut and I am no expert on this. but it worked for me and because after adding the batting I quilt some what over while quilting the quilt I can not tell where was it that the batting was joined. I mainly use 100% cotton batting or 20/80 batting. I have never tried this with any other type of batting, so I can not tell how it would behave with polyester batting or other kind.