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Don't know about a black polish but I have used Prima Amigo which is a dark glaze that may fill in some imperfections and hide them more than a white polish. It is a polymer base which can be topped with wax or sealant. Try Blackfire Sealant which does not leave a white residue.
Or, try searching for Turtle Wax Black Box. I have not used this product. Maybe another member can comment.