Since Liquid Wax requires a minimum of 30 minutes to allow it to set and dry to a haze before buffing off, we recommend applying to the entire vehicle, or at the very least a big section, such as 1/4 or 1/2 of the vehicle.
If you apply to 1 small section at a time, you need to wait at least 30 minutes before buffing off each panel which would be very time consuming.