At the suggestion of my local sewing shop, I bought "The Original" Quilt Basting Spray made by Sullivan. It is acid free and really holds well. I haven't bought any for some time so don't know if or where it would be available but I remember seeing it around. Maybe even at JoAnn's. It says on the label that it "contains no ozone depleting chemicals." It is a temporary spray so fabric can be easily repositioned if needed. I highly recommend it and it is cheaper than the other sprays. I just Googled it and Amazon has it for $10.70 but it mostly sells for around $14 for a 13 oz can, which is only a dollar or two more than I paid for my last one that I have had for 2-3 years. Not too bad of a markup when considering the economy.