I have a bolt of lightweight fusible (Pellon) so I just make sure the sides butt up neatly then I cut and fuse 2" stripes to fuse the two layers together. I could always feel thru the quilt where I zig zag the batting and since my quilts were in competition, I just picked up this idea and went with it. Make some potholder and mug rug and practice your FMQ on something small. Then they can always be given away as gifts to friends.