I tried the m90 the other day. I only used it for a binding strip. And that was leather to leather.
Here's what I learned. Spray a light to medium coat. It like to bubble. So with everything still taped off, drag a rag across it. It will remove and keep bubbles from forming. After I did that, I removed the tape and wax paper protectors.
It worked well, it flashes faster than contact cement, and the spray is much faster to apply, while the fumes disperse more quickly.
I liked it.