Owning a car means constant upkeep, and the paint takes the worst of it from sun, salt, and road grime. A professional ceramic coat keeps it looking new, but dropping twelve hundred dollars all at once hurts.
Aim for late fall or winter when detailers are slower and more willing to bundle the deep paint correction needed beforehand into the main price.
Remember that the intro window is a deadline, not free money. If any part of that $1200 balance is still sitting on the card when the 18 months run out, standard interest kicks in on the whole original amount.