Not a bash on Zaino as I have it, use it and think it is a good product. Just keep in mind that if you are using Z6 you are applying more Zaino each time. Z6 is not just a quick detailer, it is also a booster. Even Z7 wash contains small amounts of Zaino polish. This is why they are all designed as a system. You are constantly reinforcing the system when you use the different components. The only way you could really say that those 6 layers you put on back in March have lasted until now is if you hadn't used Z6 or Z7.