Restoration: Royal 10 by [[Just My Typewriter]]

Royal KHM - Techniques for Polishing Antique Glossy Black Paint by [[Dr. Typewriter]]

He used a single round of Turtle Wax cleaning compound (taking care not to over use as it can remove clear coat), then Mother's Wax to bring back the shine of black enamel paint on an early 1900s typewriter.

Vintage Typewriter Clean Polish Buff Gloss Enamel Paint to a Mirror Shine by [[Phoenix Typewriter]]

Duane polishes and buffs black gloss enamel paint on a black typewriter to a mirror shine.

His preference is for Nu Finish Scratch Doctor automotive polish.