This may be of no relevance, but...
My Verdier Platine TT is piano black, and when I had the armboard drilled, we used a paper towel wrapped around the armboard to protect it while we were using a vise and drill press.
Soon as we removed the armboard, we noticed that there were marks on the armboard corresponding to the small bumps on the paper towel. These could not be felt or polished out, but the next day they were all gone. It seems the piano finish as used on the Verdier table tends to absorb moisture from items contacting it, and given a chance to air dry, the moisture evaporated from the finish.
You might want to carefully try a hair drier on low heat to see if it has any effect.
Hope this is your problem.
My Verdier Platine TT is piano black, and when I had the armboard drilled, we used a paper towel wrapped around the armboard to protect it while we were using a vise and drill press.
Soon as we removed the armboard, we noticed that there were marks on the armboard corresponding to the small bumps on the paper towel. These could not be felt or polished out, but the next day they were all gone. It seems the piano finish as used on the Verdier table tends to absorb moisture from items contacting it, and given a chance to air dry, the moisture evaporated from the finish.
You might want to carefully try a hair drier on low heat to see if it has any effect.
Hope this is your problem.