I spray baste, but rather than hanging the quilt, I mark centers of all sides of all pieces (top, batting and backing) and align them over a banquet table. pin along the edge, then fold back the layers to spray baste.( I find it works best to spray the batting rather than the cotton top or backing. )Then smooth out each layer back into the quilt sandwich. Once the portion supported by the table is completely basted, I move it the quilt one direction or the other to repeat the spraying/smoothing process until the entire quilt is basted. I like to add a few basting pins along the outer border, which helps keep the backing from folding back and getting caught up in the stitches... I hate it when that happens.