It's just a standard silver that works on all Porsche wheels (all german for that matter) since all German cars use the same silver on their alloy wheels. They only sell one kit, you can email them if you have any other Q's. It's a paint that they have matched over the years. It's spot on, one guy on the review on their site wasn't happy, but it matches for me. I also have 19" Box S wheels. A wheels a wheel. Bad review was probably a competitor spray paint...lol
I may add one more coat, but already put the clear coat on. It states paint first, let each layer you add dry 30 min, then the clear coat. Honestly I moved the car and had to really look to find it, good enough for me and from 3 feet away, you can't see it at all. Just put on very light coats, it doesn't need much at all.