I don't know if it is because it is old since I bought it from CarQuest where some of the products are turning brown from being old, but Aquawax has durability of about a week. I put more on every time I wash. Is this normal durability for Aquawax? I wash with NXT so I don't know if that is stripping it off or not. I just now switched to Duragloss car wash, 901.