Rub'n Buff really grabs hold of the flat black paint, probably because the porous non-gloss surface grabs the pigments pretty well. It's not rubbing off without solvent. Skin oil from your fingers probably has the same result after repeated contact with the high spots on a model. You can touch it up seamlessly if you rube some off in a spot. You're probably right that I'm going to rub a lot off with my booger pickers from the hundreds of decorations on the Sovereign!Only snag with Rub'n'Buff is it can rub off.I tried it years ago and found it too delicate a finish although looked fabulous after application. I remember a Guy scratch building Royal Louis and he used it, he had a lot of issues with the finish rubbing off when he touched the carvings whilst working on the ship.
It wouldn't matter if you only had say a figurehead that could go on last, but as we both know, you have one or two more carvings than that