Here's a link to the Elmer's Spray Adhesive referred to in the original post:
http://www.elmers.com/product/detail/E451
This is *not* the school glue we all use for bindings and applique! Some people are using the Spray Adhesive to baste quilt layers together because it is considerably less expensive than 505. I personally prefer to spend a couple of extra dollars to be sure I am using a product designed for use in quilts, that is truly temporary, and that is easily washed out. Guess I am not the experimenter type.