Coating on Z1 Rotors

Read T

Quick question, that maybe some people here can answer - or Z1 can chime in.

My track-only rotors are Z1 1 piece slotted blanks. They did great for me at the last HPDE, but the black coating on the hat and the outside of the rotor has melted a good bit. I first noticed this upon installing the rotors - brake cleaner makes the hats get "sticky" and the coating started to run off the rotors as a black/grey film, even prior to installing them.

I'm getting ready for another upcoming HPDE and have now noticed that the black coating must have softened at the track and formed ridges around the mating surfaces of the wheel. The rotors now present an uneven surface to the wheel. I will probably just sand this down so it's nice and smooth, but was wondering if anyone else has had a similar experience, and what the purpose of that coating is. I assume it's just for looks.

I can take pictures if y'all really want to see


...of the rotors

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2011 Nissan 370z Black Cherry Sport Pkg - Daily Driver, , 1960 Morgan +4 fun car, 1986 BMW 325ES, 1998 M3 and 1996 Spec Miata - Race Cars
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