What to know before painting a garage door
Sixteen feet of width and about eighty square feet of face make a double garage door a bigger paint job than the front elevation of many small houses. Painting a garage door in Torrance, CA looks simple, and every teardown torrance exterior painters exploration 17 has logged shows the same thing: the finish fails at the bottom panel and the seams first. Steel doors, wood doors and insulated sandwich panels each need their own prep before any paint opens.
Steel doors and rust
Steel panels get washed, then checked for rust blooms at the seams, the bottom rail and dents. Rust is sanded back to bright metal, treated with a rust converter, and spot primed with a rust-inhibiting primer. Dents are filled with auto-body filler or spackle rated for metal, sanded flush, and primed again. Painting over rust only hides it for a season, as the bubbles show through the topcoat.
Wood and composite panels
Wood garage doors in the South Bay take a beating at the bottom edge, where sprinkler water and sidewalk runoff collect. Soft wood gets dug out and rebuilt with epoxy filler. Composite panels need only washing and a scuff sand. All raw edges get primer before the topcoat so water cannot wick in behind the film.
Bottom seal and weather stripping
The rubber bottom seal and the weather stripping around the jambs are masked off or lifted out. Painting over rubber leaves it stiff and stuck. A worn seal is replaced before paint rather than after, since a new seal pressed into wet paint leaves a mark that never goes away. The bottom edge of the door gets a full coat, because it sees the most water.
Heat and colour choice
Dark colours on a steel door facing west reach high surface temperatures in summer, which stretches the panel and cracks the film. A satin or semi gloss acrylic enamel with a heat-reflective pigment holds a deeper colour with less stress. A flat sheen shows every handprint and chalk mark, so it rarely suits a garage door that gets touched daily.
Application and cure
A garage door is usually sprayed with an airless sprayer for an even film, with the neighbouring cars covered and the wind watched, or rolled with a short nap roller for control near parked vehicles. Two coats go on, each at the recommended mil thickness, with a day between them. The door should stay closed for twenty-four hours after the last coat so the seal does not stick, and cars should stay clear of the wet surface.
Cutting in around the trim
The trim boards and the stucco edge around the door get a careful cut in with a brush, using the same scaffold or ladder setup as the wall above. A two-storey house with a garage under a bedroom needs ladders set clear of the driveway slope, a common detail on streets across Los Angeles County.