Jim's Gem

I tape the backing to the floor (actually, I now use tables, floors are too hard on the knees) cover the area outside the quilt with sheets, spray the backing, lay the batting over the backing smoothing as you go so there are no wrinkles. (this works better if you have a second person on the larger quilts) then I spray the batting and smooth the top over the batting.

Damkina

I was confused at first and was a bit reluctant to actually get started... took me three days to take the plunge, but once I'd tried it, it's a great way to sandwich a quilt together. I just wish I could remember which thread I read this idea from.

Yes, the batting goes down first as it does stick to the carpet a little, so no tape needed here. Then lay the backing into position with the wrong side down facing the batting, lift up half and spray, turn over and repeat.

For the first time ever, I didn't use any tape, pins or basting and the whole job (not including the ironing) was done it about 30mins.

Prism99

No. In the first step, the batting is on the carpet; batting will stick to the carpet without pinning, much better than fabric will.

Second step is to lay the backing fabric over the batting. Once you have it centered and positioned as you want it, you fold half of the backing fabric back over itself. This keeps it in position, but exposes the batting. (Before spraying, you probably want to place some towels or newspapers around the edges to catch any overspray.)

Spray either the batting that is exposed, or the wrong side of the backing. Fold the backing back and smooth the surface so there are no wrinkles. When you are satisfied with that half of the quilt, fold the remaining half of the backing fabric back over itself, exposing the unsprayed batting, and repeat the spraying and smoothing process (smoothing from the center out).

Once the batting and backing have been spray-basted together, you flip the entire sandwich so the backing is underneath and the other side of the batting is exposed. Layer the top as before, getting it positioned as you want it first, then folding back half of it to prepare for spraying.