For those who don't know what we are talking about when referring to basting with Elmer's washable glue here is how I do it. There are also other methods.
I lay my quilt bat down first and then the back over it. I fold back the backing and put a thin stream of glue (I hold the bottle quite high off the batting to get a thin stream) in a zig zag pattern on the batting. I then fold my backing over the glued part and smooth it out with my hands. I let that dry for a few hours (or if in a hurry can be set with a dry iron). I then move the batting and back to a new position and repeat the process. When I'm done with the back I flip the batting and backing over and repeat the process for the front. No wrinkles and by putting the glue on the batting it doesn't seep through the fabric.
When I'm done quilting I bind my quilt by machine stitching it to the front and then using a thin stream or dots of glue on the binding to hold it in place and hand sew it to the back. I then wash my quilt in warm water to get the glue out. Cold water does not work for me. I would not baste any other way!