Needs better sourcing, but

Henry Dreyfuss added crinkle paint to his Royal Quiet De Luxe typewriter design to diffuse reflected light so that typists who worked at their machines all day wouldn't have headaches from the glare reflecting off the fronts of their machines.

Yanni Giftakis recommends melting crayons into the letter groves of typewriter keytops to replace their missing paint with a heat gun, much the same way D&D players will fill in the groves on their dice.

This is similar to Richard Polt's recommendation "To restore faded paint on keys and scales, try Lacquer-Stik Fill-In Paint."

via https://www.facebook.com/groups/typewritermaintenance/posts/3831371387100282/

making custom paint for my typewriters........ by [[Just My Typewriter]]

Color matching typewriter paint with fingernail polish<br /> use phots to match colors

Based on her analysis, ranked:<br /> - Blank Beauty https://www.blankbeauty.com/<br /> - Orly Color Labs https://colorlabs.com/<br /> - Color Club https://colorclub.com/products/the-polish-factory-custom-nail-polish

Physically matching colors in person in a store may be better.

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.

Underwood Typewriter Black Matte Paint Wash & Shine Process Clean Restore Luster No Decal Damage by [[Phoenix Typewriter]]

How Duane cleans black matte paint and crinkle finished typewriters: Simple Green and a stiff brush, dry, then finish off by brushing in oil or WD-40 and wiping down.