You are right!!!
Doesn't this contradict itself. Seems you would want a clear static cling that would need a white backer once it was printed (second surface).
I think you are right about the second surface...Okay, what I got Friday was a sample of Concept 208, instead of Briteline. Grimco was nice enough to send me a sample to try out. I asked for the white, inside mountable, cling material. This is what I discovered:
It's not inside mountable (Salesperson may not have totally understood the application). This material is really for mounting outside of the window. However, it was pretty tacky on the print side too, and it did stick to the inside of the window with a wet application. However, it stuck better to the outside of the window, because that was the tackier side and the side meant to be applied to the window. After leaving it on for a day after applying to the
inside of the window, I tried to remove it to see what would happen. The latex ink came off the cling material and stuck to the window. It came off the window pretty easy, just wiping it down with water and alcohol.
So, next experiment will be with clear static cling. Then I'd put a white backer on it as was suggested above. Thank you! I had fun experimenting, but need a better solution for my Customer who wants an inside mountable window cling and she does not want ink residue left on the window after removing the cling.
Thought I'd share this, might save somebody else some time. Thank you!