Masking a car is a huge job. I decided to tape off the door openings so I could keep the doors opened and blend in the door jambs. Here is the car just before I began spraying. Again, thoroughly blow the car with compressed air and wipe it with a wax and grease remover. Tech tip: masking tape does not stick to tires. I tried to tape that painter's plastic to the tires, but the tape came undone several times throughout the job and once blew the plastic into my paint. Fortunately, it stuck to the inside of the wheel lip and didn't leave any external marks. It would have been better to cover the tires with something heavier like old towels (watch out for lint, though), moving blankets, or a set of canvas wheel masks to look like a real pro. Or you could just paint the car with crap wheels and tires on it.