Thanks for your clear instructions. I am working on 12 place mats for my daughter for Christmas and used glue for the first time to baste those. I wondered how it would work for a larger project and now I know! The only problem I have is that I self-bind (pull the backing over to the front, fold down, decorative stitch to secure) and had some places where the glue holding the batting to the backing was a bit hard to work around. The fabric was also a bit stiff in places as I pulled the backing over.
I've been spray basting for quite a while and have about ruined the spare bedroom I used. I've been spraying basting on top of a double bed, but the overspray has made a mess. I'll try the glue on my next larger project, but will use it for sure on small ones.