i use the spray baste , generally 505 i will never pin a quilt again !! ive used it to hold together from baby quilts to king size quilts with no problem and sometimes it has taken me up to a few weeks to quilt it and the spray is still holding it together and yes once you are done and wash the quilt the spray is gone also no chemicals left on the quilt nake sure the spray you by is for quilting or material ect i read where someone else sprayed there quilt but the spray glue they used was not for this purpose