A ceramic film keeps your car looking new and makes washing a breeze, but a full wrap costs about $2000. It is a big upfront hit to the wallet for something that feels more like a luxury than a repair.
Shops are usually dead in the winter when nobody is thinking about detailing. If you book during the slow months, you might find a shop willing to drop their price or include a few extras to keep their bay full.
That 18-month window is a deadline, not a gift. If you still have a balance on the card after the time is up, you will start paying interest on whatever remains, which can quickly wipe out the benefit of the plan.