If your glue is coming through the batting, it may be applied too heavy. All you need is a very thin line (like a pencil lead) and maybe every 4". Small dots also work. If its too thick, you'll probably be OK as long as you can sew through the dried glue. Yes, leave dry overnight, flip it over and do the same thing. I get the piece all lined up on the batting. Then I carefully fold back half, apply the glue (thinly, hold bottle a few feet high and dribble while moving). Smooth the fabric down securely. Then fold over the other half. Anything that soaks through or looks like a glue mark will come out when it's washed.