I've used the spray adhesive method for my backscenes on both sides of my layout without any problems.
The Peco backscene on one side has been in place for about 8 years and the ID photographic on on the other side has been in place for about 18 months.
I found it easier to lay the board down flat on a bench in my garage (with the doors open for ventilation) when fixing the backscene and I used a soft dry cloth to gently press it down and eliminate any creases etc.