I am going to attach this sign to a north facing wall above the front entrance to a pub. There is an overhang so there will be little exposure to elements. It is 15lb 2" signfoam. I was going to create a couple of small pockets in the back of the signfoam then attach a painted plywood backing, gorilla glued with bolts glued inside facing outwards and mount to side of building that way. (not sure if that's clear) There is an existing wooden sign with glued on letters, I thought I would just chip off the letters and use the flat wood already mounted to attach my bolts to. Any suggestions? Comments?
p.s. this sign still to be painted, so please no advice to paint...