I used Hobbs heirloom 80/20 fusible batting for eons. at the moment i use 505 spray. i lay my quilt layers on a table (outside) and fold the top back. spray on the batting and fold the top down patting flat as i go. when all the top is done, i flip it, smooth the backing and fold out of the way. spray on the batting again and fold backing down patting flat as i go. if i'm to man handle the quilt, i pin the edges.