I just heard of this product. I googled it and several companies make it... Is it a new product? If you've used it, did you like it? It sounds great, but if it's like the spray on adhesive I've used for paper things, it might be nasty.

I use it to keep my layers in place for machine quilting. Really helpful. The one I got is 505 spray & fix. It is pricey but it helps me do a neater job.

505 is a temporary spray basting adhesive. 606 is a permanent spray fusible adhesive. I have not tried either product, but use paper backed fusible web very often. I would think the spray fusible would be messy, wasteful and hard to control, especially on smaller pieces. What would be the advantage of using a spray fusible instead of something like WonderUnder?

I will try wonder under
I did try a iron-on fusible WITHOUT reading the directions
It turned out to be NO SEW
Well... that piece makes a lovely table runner but cannot sew thru it
Another lesson learned!!

You can reposition 505 spray for a while. Wonder under is there to stay. I really like 505 and it doesn't smell.

I just used to be piece some batting together for a small quilt. Works!