Count me in as another spray baster! Been doing this for 5-6 years now and I rarely use pins. I also mainly baste on the wall - so much easier than getting down on the floor once you get the hang of it.
BTW - I use a mask when I'm basting and the room I do it in has several windows. I am not really "afraid" of the fumes, but just very sensitive to smells in general. I don't worry too much about this being a chemical - most of my quilts are art quilts and even the bed or lap quilts I make, I figure it washes out well and definitely wears off over time.
Tanesha