I reached out to the company and they said the code only works for non-cling on backgrounds but that type of background would still work for a glass enclosure!
I was looking at their site. Do you have the cling, adhesive or non-adhesive type? I want to apply mine to the inside glass but not sure if they have the right option. Was yours on the inside?
Thanks!
Sorry for the delayed reply. Mine are both on the inside of my enclosure, so the back of the picture is sticky. Its been over a year and both are holding up excellent.