I used the stuff for the first time just a few days ago! On the first project, I used poly batting, and quilted it right away. Didn't bother to pin, that's why I bought the spray!!!!! It did start to come apart at the edges, but not too bad.
I've used it since on my next project, which is a quilt as you go double Irish chain quilt. With a bamboo/cotton batting, and it's still coming apart at the edges, but not quite so much, and this piece is getting a lot of manipulation while under the needle, unlike the other piece.
I love the stuff. Yeah, it s-cks that it's so expensive, and I def. won't be using it on everything, but when I can, I will!!!