There isn't a bigger Zaino fan than me and it lasts forever on my "almost" garage queen. I also used Zaino on my wife's daily driver (ZAIO, Z5, Z3, CS) and it seems to have very poor durability. I cleaned it and applied a coat of Z5 followed by CS about 2 months ago and when I wash it now there is absolutely no water repelling like nothing is on it. Zaino is known for durability, and I'm seeing it on my other car but not sure why it performs so poorly on my wife's car. Has anybody else experienced this? Could it be that Z5 is not durable unless followed by Z2 or 3?