I have before and after compared the car or my girlfriend and my own car: in untreated water cars glued properly as "layer" on the disc. When treated cars the water runs off and goes down immediately. In any case, the effect is ever really great and convincing, as I had expected! I've always wanted to have such a water-repellent effect, as one often sees in movies with cars (so I came up with the idea: P). Now I just hope that is not reduced by even after a week or two, but hopefully a few months will remain so! A star deduction there, because the bottle with a little scotch sealed with me and got about an eighth of the bottle had been leaked in the package ...