Here's what I do...... on my kitchen counter I lay out my batting with backing on top, then roll the backing half way up. Starting in the middle, using a piece of cardboard big enough to control the spray, I spray,about a 15 inch square and start unrolling the backing onto the sprayed area smoothing it as I go, pin if needed. Once that side is done I turn it around and do the other side. Turn it over and do the front side. This way I am always spraying the batting and smoothing the fabric.
Goo Off cleans up any spray on the counter asap. Then I 409 the counter.
Syl