i suppose it would depend on the type of batting. wool might felt fine, but i don't know anything about cotton fibers. the high-loft batts would be out, because the felting motion would flatten the fibers and probably wouldn't work anyway. i think i would stick with the tried and true methods of zig-zagging by machine, zig-zagging by hand, using a tape made for this purpose, and someone mentioned using a tricot iron-on interfacing. i just wonder what the more experienced quilters have to say concerning this thread.