Except for wall hangings I don't want to wash, I baste all my quilts with Elmer's Washable School Glue. I've diluted the glue about 50/50 and I've used it undiluted and I haven't noticed any difference in how well it sticks, but it's a lot easier to squeeze out of the bottle if it's diluted. I never iron the basted quilt, I glue the back to the batting and let it dry over night, then I flip it over and glue the other side and let it dry several hours or over night again. I use my dining room table and the quilts usually hang over the sides, sometimes almost to the floor on both sides and I've never had a distortion problem. I only use cotton or 80/20 batting and I've had no problem with it coming apart or shifting. I believe I've heard that the glue doesn't stick as well on polyester batting. There are several good discussions on the technique on this board. Just search on glue basting or Elmer's.