I used felt for my design wall. I did not use any spray adhesive though. I have a tutorial on my personal webpage on how I did it -
http://yarn-or-fabric.weebly.com/1/p...sign-wall.html
The felt holds great.
I the felt I used was from Walmart. Everything I have ever tried to stick to it, sticks - although blocks/strips that are too heavy need a pin or two to keep them in place. I have had a kaleidoscope quilt on the design wall for months.. literally months.. and it hasn't started falling off yet.