ive had a few and all of them over time started to flake off, so i would just keep an eye on it, i had my along the back and from top to bottom, see how you get on. most of those back grounds where made to go on the outside, like for fish tanks etc, glass tanks. ....
but see how you get on, and keep me posted because i would love to find one than doesnt flake over time lol add a bit of colour for diesel.
xx