I've used the spray a few times, so I can give you a little info. Yes...it does get over spray on EVERYTHING...so make sure you cover stuff up with a sheet or newspapers or something. Also...try to only use it with the windows open or outside or somewhere..the fumes are strong.
1 can will do at least a queen and a couple of small baby quilts.
It will be repositionable for a couple of months...after that...you're stuck, so if you take a while to hand quilt...I'd be leary of it. I haven't done that, only machine quilted.
I have used it for my big queens, but I haven't used it on baby quilts as I'm scared that what they say is 100% wash out...won't. But thats just me :oops:
Otherwise, have fun! It is a great option!