So now I have removed the Gen 3 SC and inspected the internals and rotors.
It is absolutely washed clean. No residue at all on anything.
One rotor is perfect except for a small 1/2" long piece of coating missing on one of its three lobes.
The other rotor only has one rotor coated with epoxy. The other two are shiney clean aluminum.
One observation before I removed it, was when turning it manually by hand in one direction it squealed.
Then I started thinking about spraying liquid inside the SC and what it might do to the internal rotor bearings.
It might be possible to spray directly into the LIM but it'* tight and once installed, I wouldn't be able to remove it unless the SC is removed as well.
I still want to inject pre-rotor.
Maybe I will have to tear into the Gen 3 to inspect the bearings........