OK, in summation, you can buy 505. You can buy hairspray. You can use both on fabric. One is made for fabric, one is not. Both have chemicals. Hair has oils, so hair spray washes out. Cotton has no oils. 505 may leave a residue in the quilt. Hairspray will leave a residue in fabric.
I think I've got it.
If I grease my quilt, I can use cheap hairspray, but shampoo will foam in the washer....Got it!
Mwhahahahahaha!