Their web site states 8 months protection vs. 3 - 5 years for the Crystal Serum Light, but impossible to tell what that would mean in real life. Otoh, the easiness of application is a big bonus, so assuming that the surface stays in A1 condition for, say, 2 months, one could repeat the process bi-monthly and stay on top of things without having to go back to cleaning with polish. Maybe someone could give it a try?
