I used to safety pin my sandwich but I always got a wrinkle in my backing that way. The 2 methods I use now are: Hobbs 80/20 fusible quilt batt or 505 spray basting. The Hobbs is ironed to make the quilt sandwich to get it ready for machine quilting. The 505 spray is used to spray on both the backing and quilt top to baste it to a quilt batt.