It appears from reading your first posting the raised lettering is the same brass but not actually embossed because there is no corresponding depressions in the back - Correct? Though from the picture I can not tell about the "Wayne" in the center. If this is correct I would use more chemical action like "nevr dull" or brasso (if they even still make that stuff)to polish rather than a true abrasive and then clean the raised letters to remove the residue (from never dull as I think it leaves something behind to prevent oxidation) and paint the raised letters black. Again as always experiment with the back. As I said I can't make out the wayne wording and you might have to have T-way make an identical decal. John