I know you use rubber cement, along with various other masking agents, to make splashes in anodizing. But are you telling me rubber cement was used to mask off this AGD silhouette in this pic? If so, that's some incredible skill with rubber cement.
To me, it looks like it was done with a vinyl sticker, which is another method of masking for more detailed things. Google it and watch a video on YouTube if you don't believe me.