i use Heirlooms 80/20 cotton batting. usually fusible. and i'
ve put the batting under the top and fused and quilted it and then added backing and done the binding. then washed!! if i spray basted, i do the top to the batting and turn over and spray the backing to the batting, then quilt.
i think i only have one pkg of batting that mentions scrim. i will watch that one but still, i add backing before washing the quilt.