I can't say for certain that its fool proof but here is what I do. I also prefer 505. I trim my backing to the quilt top size plus four extra inches on each size with the "center" centered ( does that make sense?). I trim the batting to quilt top size plus four inches all around. Then I use chalk to mark a center vertical line and a center horizontal line on the wrong side of the backing, the wrong side of the quilt top and both sides of the batting. I tape the backing to a large wall, wrong side out and fairly taut. I fold the batting in half along the horizontal line and spray one exposed side with 505. Then, holding the batting with the folded edge up and the sprayed side away from me I approach the backing fabric. Matching the center, I carefully smooth the lower half of the batting to the backing working from the center lines down and out. It helps to have at least two people to control the batting. When I have the lower half adhered with the horizontal and vertical centers matched, I spray the upper half of the batting and being careful to match the vertical center line, smooth it to the backing working upward from the horizontal center line. Are you with me? Next I fold the quilt top in half, wrong side out, along the horizontal center line. Spray the batting with 505. Holding the quilt top with the folded edge up I match up all the center lines again and smooth the lower half of the quilt top to the batting working from the horizontal line downward and out. Then smooth the upper half working from the line upward and out.
I hope all that makes sense. I'll be interested in seeing what other people do! Good luck how ever you decide to do it!
