I've been using POR15 products for about 10 years now, in fact I sell it also. Believe what everyone says about this stuff, it works! I have an issue with the silver, after being on the bolt heads of my undercarriage for 10 years, they have dulled a bit. I did the entire undercarriage in glossy black 10 years ago, and absolutely no chips or dulling, and most important, no more rust. It is still a mirror finish. I sold the 32 this was on last year. The new one is getting the same treatment.