I have used in the past (prior to the CVO) with no issues. Used it on the SEEG some time ago and never put 2 & 2 together that the S may have damaged the finish on my derby cover.
My custom engraved derby. The coloring is actually only a "candy" and not a full finish paint process. Came out good, I liked the way you can see through it and it changes color with the amount of light reflected.
Anyway, it looked like this new:

After a few S-100 applications it started to craze.



The engraver refinished my covers at no charge 4 years ago
I had forgotten about he S-100 and when I got home from MV I wanted something that I could do in the short term to get the bike partially cleaned and de-bugged.
So now I get to once again send my covers out to be refinished.
Like oven cleaner - test in a small inconspicuous spot first.