Not sure if it's still an issue these days, but some time ago, a young relative of mine had a chequered flag decal applied to both sides of his white Peugeot 106, not my cup of tea but it looked like a good job and kind of suited the car.
But, within a couple of months (during the winter) there were a couple of areas where it had began to lift but worse of all, rusty streaks began to appear on the paintwork, mainly on the edges of the decal!
If you looked closely, you could see what was causing it... the fitter had obviously used a sharp craft knife when trimming the decal, but the point had gone through the paint to the metal underneath!
A little while later, he ended up having the decals removed and both sides resprayed.
I've seen some of the videos on YouTube of cars being wrapped and you'll often see fitters trimming against the paintwork with a craft knife, surely this could have the same effect, especially with our winters