I glued a quilt batt to the backing yesterday and let it dry overnight. This morning I put the top on it and started to glue that. Then I found that the back and batt were not sticking together. I had already put on the top at this point, so I used the iron to heat set the glue for the top, and I'm going to have to roll the top and batt off the back and re-glue; or I can put some basting pins in. I have those, and it might be easier now than rolling everything up.
I had my glue thinned 50-50. But I was using a thin batt with a smooth surface. Maybe the glue doesn't hold on the scrim of some batts. I have no idea what brand of batt it is, because I got it from "somewhere?". The top seems to be sticking now. I did another quilt with a fuzzy batt last week with the glue, and it worked just fine.