Bench Grinder Rotor Help

[Hayden_yp]

Hi all,
This might not be the best place to post this thread but bear with me, I am new to the forum.

I'm restoring a bench grinder and the rotor has this red finish over it, it's all patchy so I don't know if I should leave it as is or repaint it. I believe its Glyptal but I am not entirely sure. Perhaps it's to protect the metal from rusting. Also unlike a normal rotor which has shorting end rings, this one doesn't which I am confused about. Instead, there is some black putty that covers copper, I don't know if it's supposed to be black as well. It's pretty old, the year 1958 is printed on the stator.

 

[Roberts210]

Glyptol is mostly used on the windings to preserve and protect. When I rebuild an elec. motor I brush it on the windings. I'd leave the thing alone. Does it work?

 

[Hayden_yp]

It does work, I might just leave it as is like you said and only clean up the shaft.