I use my cutting table (40" x 72") and 2"-wide clamps (office supply store) to secure the 3 layers around the edges of the table and then I pin ... a section at a time. However, the pinning is annoying, as is the pin removal as I'm quilting. A couple nights ago, in my quest for any & all good info. to improve my FMQ, I watched a slew of videos. One woman has a large felt board wall??? into which she can stick straight pins. She covers it from floor to ceiling with newspaper, then pins her backing to that, spray bastes it with 505 adhesive spray, then the smooths on the batting, ditto spray baste, then the top. She smooths the whole thing and the 505 keeps it adhered for a long time, allowing her to FMQ without having to remove any safety pins. In the video, it worked slick as a whistle, but I don't have the wall space nor the felt board that I can stick pins into. She also covers the floor area (with an old sheet) in front of the wall to catch any stray spray adhesive. I'm trying to come up with a similar pin-free basting plan that will work for me to include NOT breathing in the spray adhesive.