After the initial prep for the Zaino, all that is needed is either a coat of Z2 or Z5. I use it once every 2 months. The Zaino stays and stays....With Zaino products to you complete the full regiment (i.e. Z1 Z2 Z5 Z6 and Z7 etc.). I have never used these products, but am interested in trying them. How is the long term maintenace? Do they wear well or am I reapplying weekly, monthly? Thanks.