If hell bent on polishing!!! Scuff lightly with 1000 grit emery cloth to remove deep scaches. Apply hot parafin wax/ carnuba wax (hardshell car turtle wax and or compound). Let cool dry. Buff with terry cloth. no car buffers. They will burn the wax off. apply boot polish and polish. Note spit is a cooling agent to keep the wax polish from burning.
Note: no bees wax. It is to soft and will not polish to a high shine.
Also never apply silicone sprays or liquids.
Try this on an older boot first.
Cheers