Best use on very flat surfaces: Glass, Flat Tiles , Formica.
Avoid: Installing Sticker on "Gaps", tiles that are smaller will have more Gaps. Little gaps should be ok, not too many.
Sticker will last for years!! IF installed correctly. If its falls off, then most likely is the wrong installation method used(surface not clean, preferably use Solvents) Or surface is a painted and uneven wall.