Rust on the sunroof, and sunroof only. Metal experts??/

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I have my CGT's sunroof firmly bolted with 10 SS 1/4" bolts, and two weeks ago
I cut it to put a vent (this is a rally car).

While cutting, I noticed that the sun roof has several small dots of rust, but
the rest of the roof doesn't, neither anywhere else in the car.

Is this some kind of metal reaction to the SS bolts? What to do on this case?

Is this something similar to what happens with boats (sacrifice anode)?

TIA,

Carlos.



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