Repainting a Garage Door Without Warping It

Six panels, four coats of old paint and a door that now rubs the track are the arithmetic of a garage door repaint gone wrong, as the notes at painting riverside ca curiously veg radio describe. Paint work on garage doors in Riverside, CA starts with heat, because a driveway facing west turns the door into a hot plate by three in the afternoon, and what goes on it has to survive that.

Steel against wood

A steel door shows its age as chalk and small rust blooms at the bottom edge and along the seams. A wood or composite panel from an older house shows hairline cracks and raised grain. Steel wants a scuff sand, a wipe down and a bonding primer. Wood wants sanding back to firm fibers, a patch of spackle or wood filler in each crack, and an oil based or acrylic primer that seals the grain before any topcoat.

Dark colors and warped panels

A dark color absorbs far more heat than a light one, and a thin steel skin over foam core can bow when it gets hot on one side and stays cool on the other. Many door makers print a limit on how dark a door can go for this reason, and sheen matters too, since gloss reflects a little more light than flat. Satin or eggshell exterior latex in a mid tone is a safe path on a sun facing door.

Cleaning chalk and checking hardware

Chalk comes off with a wash and a scrub, and the door needs to dry completely, including the seams where water hides. Before any paint goes on, the crew tapes off the weatherstripping, the window inserts and the hardware, and masks the track and rollers, because a painted track makes the door shudder and a painted rubber seal stiffens and tears.

Spraying against rolling

An airless sprayer gives the smoothest finish on a flat door and gets into raised panel profiles in seconds, though overspray on the driveway and neighbors' cars means masking a wide area and watching the wind. A small roller with a short nap and a brush for the panel edges gives a thicker film with less masking. Two coats are standard either way, with a light scuff sand between them on a gloss.

Timing around the day

Painting a door while the sun is on it flashes the coat and leaves lap marks. The door gets painted in morning shade or the early evening, left open a few inches only after the surface is dry to the touch, and kept closed for a full day before it is cycled hard.