I've seen the posts using the paintbrush and a thinned glue, but I do not like any more work than absolutely necessary. I use the glue, full strength, right from the bottle with the tip wide open. I use two hands and squeeze and moving the bottle back and forth to form a grid of thin lines (at least that is the plan, not always neat and straight) of glue onto the batting. No brush, no diluting, less cleanup if any and the fabrics in my sandwiches DO NOT MOVE. I did a 96x96 sandwich this morning and have already stitched the diagonal lines edge to edge as well as the outside edge staystitching. Now it is ready for my to draw in my pattern for fmq. I am always looking for ways to cut down on work, and this method is the best I've found.