your mistaken there was NO coating loss.
This is what the coating looks like, it still has a slight shine to and is gray in color.

umm i can see where the coating is and where it is not.....you has some coating loss either when it was on the car or when you cleaned it

the dark color is where I did not clean good enough .
Thereis no loss of the coating

It may be that you aren't sure what you're looking at. You'll have to trust those of us that have taken these things apart countless times. You have significant coating loss.

The coating is dark gray. I can see MANY places where it'* missing, and you are down to bare aluminum.

And it'* obvious I'm not the only one that can see it.

I can tell you that there is absolutely no bare aluminum. I have worked with many types of coatings through out my 25 yrs as a tool and die maker / mold maker and this does not have coating loss. . I used a product called LPS it is a very mild brake cleaner, and is used widely in the cleaning of coated die steels and in the plastic mold industry.

My 94 SC with 150,000 looked just like this..before cleaning..well it was greasier but yeah still missing coating like this one is:

I've highlighted the uncoated areas of your rotors.

You are down to bare aluminum, and I can clearly see the CNC grind marks used to machine the rotors. These marks are very muted in the coated areas.

I'm not going to sit here and argue with you. I'm sharing the best diagnosis I can offer based on my own personal experience.

Too funny! Posting at the same time, using the same colors!

I'd say about 25% coating loss from this view, and it will get worse over time as the edges begin to flake away. You have already lost boost, and are continuing to slowly over time. You won't notice it in the winter as much in the cooler, denser air, but I'd say you'll be down about a PSI or so come summer. Maybe worse.

I'm faster.


I dont think the cleaner caused the coating loss.

I do. Looks exactly like two others I've seen personally that did the same thing. One was my boss. He caught himself in time though, and switched to a milder solvent.