I have a cutomer that wants to mount a 3' x 8' of gator to a wall. They want it to stand off of the wall about an inch. I understand I will need 1" gator for this but my question is......how to I affix it to the wall? I see this everywhere and have even done it at my house but I used silicon to attach it to my wall. Needless to say I will have to replace the entire wall if I ever take it down. I don't want to use silicone with my customer. Any suggestions would be appreciated.