Carol, are they the kind with the holes like mesh? if so, I would not fuse them but rather sandwich the individual block with muslin and pre-quilt the 2 pieces together. A can of the spray adhesive would help also, just give the back of the jersey block a few sprays then lay it on the muslin. Then, once all your blocks are done like that and your top is done, use flannel as a batting and a normal backing. the fuseable webbing might come through the holes of the mesh and be kind of messy for you.