FYI-
Another good discussion on Elmer's for basting (and binding, and piecing, and...and...and...)
What I've gleaned from both of these discussions (the abridged version):
Specifics: Elmer's = SCHOOL glue (other thread) or WASHABLE school glue, or Elmer's glue sticks. NEVER Elmer's Spray Adhesive.
What you can do with it: Anything you want (piecing, binding, basting)
How you can apply it: Any way you want. Just don't make globs. Use special tips, paintbrushes, or kitchen tools...or don't.
How to thin it: 3:1 (Glue:Water), or don't.
Have I got all this right?