I have used "The Last Coat" on both my wife's black Audi and my black Edge ST. Been through several rain storms with both and no rain spots on ether vehicle. The paint still extremely glossy. Definitely recommend. There are several videos on utube comparing to other premium products. Well worth the cost. They also provide a soap product that contains some of the chemicals used in the sealant so it refreshes the coating with each wash. Haven't used it long enough to determine its longevity. The company recently introduced "The Last Coat 2" which it says now contains some ceramic molecules to in grease the durability. Check it out..