I have been following this discussion with great interest, since I too saw that demo on The Quilt Show. It looked so easy! And the pin basting is a right pain.
But I have some further questions on the "highly flammable" bit.
First, I smoke. Now of course I am not stupid enough to light up a cigarette and start spraying my quilts with this stuff. My questions are about the residue.
If I were to try this, I'd definitely do it out on the deck with something underneath to catch the overspray. I'm thinking a tarp maybe, since I've got a couple of spare ones around. But will the residue on the tarp (or any that might get on the deck) still be highly flammable? And what about my quilt? Or is it just the propellants that are so dangerous?
I tend to worry way too much about the warnings on the labels of anything, even though I know a lot of it is to distance the manufacturers from any possible liability. Still though, I'd just as soon not become a torch. LOL