Oh I said spray adhesive, not spray interfacing. My interfacing didn't have any sticky stuff, so I bought a can of spray adhesive to make them stick together. Rumor had it on the Internet somewhere you could buy Spray Stablizer, that would wash out (which would be great because then when the quilt is done all that is left in the quilt is the wonderfully soft fabric), but I looked and looked locally and couldn't find it.

I sometimes use old clothes or other fabrics, but I will say....

I would not use them if I am making a quilt intended to become an heirloom. Fabric does wear out with washing and wearing, and if I am going to hand quilt a special quilt, I will use all new, good quality fabrics in it. The same applies for quilts I make to sell.

But for 90% of the quilts I make, I don't mind used fabrics.

I totally agree. The out dated clothing fabric is excellent for beginners or for "memory" quilts or for ourselves when we really are just making a utility quilt. I sometimes wonder why I don't take the time to make at least one very special quilt for myself; then I think it is because I (as well as my granddaughter) love quilts so much that it is difficult to decide just how we we want to design that special quilt.