spray basting. can's of a light spray that you spray onto your quilt backing, gently lay the top down and smooth, turn over and spray again the other side and lay the backing down smoothly. All done basting!!
Sulky, 505 etc. there are several brands out there. i would spray outside with the quilt on a folding table if i were you but it works wonders. no more pinning or thread basting the layers together for me. too hard to get up off the floor or bend over forever when using a table.