I am very lucky that our church quilting group has 3 or 4 of those lovely big white plastic tables. They can take almost any sized quilt I can come up with. I lay out the backing and tape it down with masking tape. I try not to stretch it because my other two layers are just smoothed on top and then I pin about 6 inches apart. I have not had any problems with this method. I have never tried basting spray. I do not know anything about the effects it would have on my lungs (or my kitties).