Just tested Dr. Colorchip on my CO Boss. Color match is perfect (CY). I've used Langka before on rock chips, and I must say the DR. Colorchip system is much easier. What I liked about the Dr. Colorchip is when you use the blending solution to remove excess paint, it works effortlessly and it does not have a chemical smell like the Langka does. I'm still perfecting my rock chip repair techniques, but I recommend everyone pic up some Dr. Colorchip for their Boss.