I glue baste pieces where corners meet so they don't shift when I sew them -- for me pins shift a lot more. I spray baste when I layer my quilt so I don't have to pin it closely or hand baste it. I use Elmers for my piecing (with a small tip ala Bonnie Hunter), but I have always used 505 to spray baste. Someone on the board mentioned diluting Elmers and putting it in a spray bottle -- I have not tried it. I would love using Elmers to baste the quilt layers, but my hands hurt too much to much to be squeezing a bottle like that.