Thanks for the info on the spray basting. I have been suspicious that this might be a problem over the long run. Have also read comments about the markers that disappear or can be washed away to the effect that they will eventually cause the fabric to deteriorate even though they have been "washed out". Have personal experience with the poly batting eroding fabric on a quilt top that I completely hand embroidered some 30 years ago (I was really, really young way back then). Guess the solution is just to go back to regular basting methods and to also stay away from petroleum products!