depending on the overall size of this graphic, you might want to warn advise the customer that the thin lines in the text will probably start peeling - that it will most likely peel easier than the rest o the stuff. I try to steer my customers away from stuff like that, or at the very least, give them a heads up about it - and the fact that I do no warranty stuff like that.
I also typically don't do the "installation" part of the job, but will give them instructions on prepping the surface properly.