Wow, you ladies/quilters were busy after I went to bed last night! I use The Original Quilt Basting spray and it has very little smell - i got my cans at Hancock Fabrics (in MN) for only about 8.50 on sale, so I picked up two cans.
I spray basted my current project about 2 weeks ago and it is still stuck fast - with absolutely no slipping or puckering when I am quilting - which always happened when I pin basted! I spray mine outsideon the patio with a blanket underneath. I spray one side of the batting, then fold the backing in 1/2 and then gradually work the backing smooth over the batting from the bottom to the middle, then unfold the upper 1/2 and gradually smooth out to the top. I do the same with the quilt top and had no real problems with wrinkles. It's nice that the spray allows for the layers to be repositioned if it is not smooth.
I'm glad that there are so many of you who might try it now!!!