I've used the ColorRite paint pin to touch up my LE wheel because of a rock chip. Blends right in if you ask me .... here's where to buy ColorRite 2Tip Cadillac CTS Automotive Touch-up Paint - Satin Graphite Metallic (Wheel) WA784U - Color-and-Clearcoat Package
https://www.amazon.com/dp/B00JC8VNDY..._7cXNCqKh1tmTS