I did something similar on mine; it wasnt as deep, but further up (well, Im not entirely sure I did it, someone else may have done as I park on-street).
I ended up respraying part of the front bumper myself, and it looks OK, except the laquer hasnt come out very glossy at all. The whole left-hand corner of the bumper is now matte, so when the weather gets warmer Im going to have another go with the laquer.
I wish Id got it done properly now! Hope you get yours sorted soon Arianne, I know how annoying it is.