I use glue to baste my quilts and use poly batting on most of them. Since it is poly, I do not iron the glue to set it and let it air dry (about an hour is long enough to be able to move the quilt or flip to do the other side). The biggest advantage I can see is that Elmer's Washable School Glue is much much cheaper.....it washes out 100% in warm water and detergent....no nasty fumes .....no overspray.....sewing through the dried glue is simple, no gummy needles. I will never use anything else to baste my quilts (at least until the next greatest thing is discovered...LOL).