I actually have a mat that I use spray baste on. It is an old mat that had deep grooves on the right side of it .. so I flipped it , and use the back side. I spray the mat to hold some very long 45 degree cuts that I make ....and the piece has many many seams, and I need to get mutiple "slices" that are all true 45 degree cuts with out the fabric moving when I pick up or shift the ruler.
It works really well for holding it ... another thing I use is painters taper for securing the perimeter of some complicated cuts.
I have washed the mat occasionally in warm water with a bit of dish soap as over time it does get "spray build up" and will collect lots of bits of thread and lint.
Just to put a real twist in ... I sometimes like to cut regular projects on my "treated Mat" when it just a bit tacky ... it really is quite amazing how nice it is to work on fabric that does not shift . But notice I said a bit tacky... if there is to much it will transfer to the fabric.