A ceramic coating turns your car into a low-maintenance machine that repels grime and stays glossy for years. It is a solid investment if you plan to keep your vehicle for a while, but the upfront cost can sting.
You should aim to drop your car off during a dry week in the spring. Shops are often less swamped than they are in the winter, and the stable, mild weather helps the coating cure perfectly without the stress of sudden rain or extreme heat.
The 0% window is a deadline, not free money. If you have a remaining balance after the 18 months are up, the interest will jump to the standard rate, which can get expensive fast.