How to Properly Repaint a Metal Garage Door

Garage doors act as the primary aesthetic face of most homes, yet they suffer the harshest conditions of any painted surface. Constant exposure to ultraviolet light, extreme temperature swings, and road debris causes factory finishes to chalk, peel, and fade over time. A professional-grade repaint not only restores curb appeal but creates a durable moisture barrier that prevents structural rust. Achieving a factory-smooth finish requires discipline in preparation. If you skip the cleaning phase or ignore minor surface rust, the new paint will fail within a single season. The goal here is to create a chemically clean, slightly textured surface that allows the topcoat to bite into the metal. When done well, the finish should feel smooth to the touch, appear uniform in color, and stand up to years of direct sunlight.

  1. Clear and Mask Everything. Remove all items stored against the inside of the door and pull your vehicles out of the garage. Use painter's tape to mask off the rubber seals, door handles, and windows.
  2. Scrub Away Grease and Grime. Scrub the entire door using a mixture of mild dish soap and warm water to remove grease and road film. Rinse thoroughly with a garden hose and allow the door to dry completely.
  3. Sand the Metal Smooth. Use a medium-grit sanding sponge to lightly scuff the entire surface of the metal. Focus on areas where the paint is peeling, sanding until the edges are feathered smooth.
  4. Kill Rust Before It Spreads. If you find patches of bare metal or rust, sand them down to the metal and apply a direct-to-metal rust-inhibiting primer. Let this cure according to the label instructions.
  5. Prime for Perfect Adhesion. Roll a coat of exterior bonding primer over the entire door, working in thin, vertical sections. Ensure the primer covers all edges and corners where panels meet.
  6. Two Coats for Durability. Apply the first coat of high-quality exterior acrylic paint. Once dry, apply a second coat, moving horizontally across the panels to ensure complete coverage of the indentations.