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How to Repaint a Porcelain Sign

Prior to the popularization of stamped metal signs in the 1950s, most advertising was made of porcelain-coated sheet metal. Today, these signs are collected by advertising and specialty collectors alike. In many cases, the signs are left as is or only cleaned. In some cases, however, collectors want to touch up a vintage porcelain sign or repaint the sign entirely. This is usually done by using enamel paints because they dry to a hard finish, and they are typically what was used on the original signs. Acrylic enamel paint is typically the easiest to apply for novice painters.

Things You'll Need

Soap or porcelain cleaner
Water
Soft towel
Paint brush
Acrylic enamel paint

Instructions

- 1
  Clean the sign, using mild dishwashing detergent and water. Use a soft towel to buff away any dirt.
- 2
  Purchase a can of acrylic enamel spray paint for your base. You can also use traditional acrylic enamel paint as well, but it is easier to avoid brush strokes and marks if you use spray paint or a paint gun. Shake the can for 30 seconds to 1 minute to mix. Hold the can 12 to 18 inches from the surface and spray a thin, even coat onto the sign. Repeat before 1 hour or after 6 hours. Allow to dry to the touch.
- 3
  Dip a soft synthetic paint brush in a pot of acrylic enamel paint. Touch the brush to the surface of the sign; paint by moving the brush strokes toward you. This will help the enamel to adhere to the porcelain and will leave fewer brush strokes.
- 4
  Repaint the sign, using only this brush stroke. Allow the paint to cure for 16 to 24 hours before handling the sign. Some acrylic enamels have extended drying times and may take up to 48 hours to dry.

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