We have 3 vehicles that we use Zaino on. It is the best product I have used in many years of polishing all the vehicles that I have owned.
It is time consuming, but worth it. A real time and work saver is investing in a random orbitor polisher (IE: Porter-Cable). This make the job go a lot easier.
we use the Zaino process 2x / year - in the spring, & in the fall.