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All I can say is that I used to carry mail with my truck and that stuff WORKS! The routes I used to deliver had well over 500 stops a day on them, never mind my normal driving. After about a half a days work my clean wheels were gray, and after a week they were black. I got sick of constantly cleaning my wheels as to not stain them so I tried the armor all. I went one week before I noticed very slight buildup in front of each spoke. It was close to a month, no matter the weather conditions, before I had to reapply. I used about 3/4 of a can for all four wheels, but it was well worth it in my book. Highly recommended!!!!