I like 505 and have had great luck with it.
I use my picnic table and another table the same height, put an old plastic table cloth over them, use clips on one end and gentle work the backing, batting and top with my hand as I roll it up to keep it smooth. Then I spray a short section, then unroll a little more, spray, etc. I have always got a very smooth quilt this way. I also use a few safety pins around the edge to keep it in place, just as a safety net. Never needed then so far.