Air bubbles
I used the 12” on the side of my fish tank.  It looks really cool.  Once you start sticking it on, it’s not easy, if at all, to reposition or remove.  Had some issues with air bubbles so I had to use a needle to pop them and smooth over.  It’s a sticker and a pretty adhesive one so once it’s there I’m sure it would ruin it to take it off.  Be more careful when applying it, unlike me, and maybe you can avoid air bubbles; however, it’s an easy fix with a fine poke with a needle and then pressing flat.  And make sure it’s where you want it before you start.
Rating: 4 stars