I cleaned the rotors that I intend to use, soaking them in carb cleaner for
a week.  They clean up real nice.  I noticed a patchy light almost looks
like an adhesive deposit on the side surface located between the side seals
and the edges of the rotor.  Does anyone know what this is? Thanks

Joe Berki

It is probably a Teflon coating that reduces the crevasses around the edge of the rotors to reduce unburned HC storage for emissions reasons.

Paul Lamar