It's a great idea for those who have a wall that big. I don't so I just stick to the Sharon Shamberg way with the boards and stitch baste. I can't stand the smell of the 505 and would definitely need to have windows open. It's a great idea for those with accomodations ofa wall that size though!

I don't have good air circulation in my apt and no wall space but an interesting idea.

Patsy Thompson has a you tube video on this also:
https://www.youtube.com/watch?v=2UoUzK19Vww

Really saves ones knees and back.

I have been doing this for a number of years, spray basting on my design wall. My wall is not as large as in the tutorial but it works soooooo well. It is fast and flawless. I do put paper on the floor too but the tut suggested an old sheet. What ever works, work! Give this a try. It really does work well. (And is easier on the back and knees! :))

Thank you so much for posting the video, Jan. It occurred to me as I was watching the video that I have no walls inside my house that i can do this on. What to do, what to do?! I am going to go to Home Depot and buy some of the large foam boards and then cover them with flannel. These can be stored in my garage. Then I can bring them out and place them side by side outside and then proceed as the video shows. This way I also don't have to worry about the spray getting on other items and furniture inside. I am excited about this and sure hoping it will work.