Lot of history on this website about shellac-based French Polish and Parkers. Even some discussion in TPS Ch. 10. I have had good luck with it on revitalizing overly worn finishes, i.e. with 50% or more gone . If the finish is mostly all there, only crazed or cracked looking, I leave it alone. Search "shellac" or "french polish". Austin had the seminal article, I believe.
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