There was talk not long ago about using 505 basting spray on fabrics other then cotton. Up until recently I had only used it on cotton...Well this last top I have to finish is the one I made from my daughters old scrub tops.Since it was a poly blend, I used the same type fabric for the back and a poly batting.
When I first sprayed it together, it seemed to be fine, but now, about 10 days later, it's no longer holding and I took it back apart. It was only stuck in a few places. So I guess if you use it for fabrics other then cotton, don't spray until you are ready to quilt!!

Ditter

oh no, thanks for letting us know

That's good to know, thank you for the tip.

Great to know. In that situation, I would be inclined to machine baste with soluble thread after spray basting, to keep the sandwich together longer!

Oohh, another good idea!

I have never tried it on poly blend fabric. Thanks for the heads up.