How to Paint a Garage Door in Florida Heat and Salt Air

How to paint a garage door comes down to three things. Clean it well and use the paint your door maker allows. Then pick a color that can take the sun. Most steel door makers ask for a 100% acrylic latex exterior paint. In Florida, a light color matters as much as the brand.

This guide follows the painting steps published by Clopay, Wayne Dalton and C.H.I. Overhead Doors. Always read your own door’s manual first. Painting the wrong way can void the factory warranty on the finish.

What paint works best on a steel garage door?

A 100% acrylic latex exterior paint is the safe choice for most steel doors. Clopay’s painting instructions for its Coachman doors allow flat, satin or semigloss in that type. They say oil based paint and alkyd modified latex will void the warranty. Wayne Dalton does not recommend oil based paint on its steel doors either.

Not every maker agrees on every detail. C.H.I. allows a premium oil base or latex exterior paint on its steel doors. That is why your own manual wins over any general guide, this one included.

Primer is only needed where bare metal shows. Clopay says to sand the spot and use a rust inhibiting, zinc rich primer. It should be labeled for bare and galvanized steel. Wayne Dalton warns that latex paint right on bare steel can speed up rust.

Why do dark colors cause trouble on Florida garage doors?

Dark paint soaks up heat, and a hot steel door can bend. Wayne Dalton does not recommend dark colors, mainly on doors facing south or west. It says the heat can bow the sections and fade the paint. It calls for a color with a Light Reflective Value of 50 or higher.

Light Reflective Value, or LRV, is a number printed on most paint chips. It runs from 0 for black to 100 for white. The higher the number, the more sunlight the color bounces away.

Clopay is a bit more flexible. On some of its doors, colors under LRV 38 must come from its list of approved paints. On some C.H.I. carriage house doors, colors under 50 LRV void the warranty unless you use an approved paint. In our sun, a light or mid tone color is the easier path.

How do you prep a garage door before painting?

Prep matters more than the paint. Clopay says the door must be free of dirt, oil, caulk, wax and mildew. Wax is the hidden problem. Wayne Dalton’s steel door guide says wax left on the surface will make new paint peel.

Learning how to paint a garage door starts with these steps, taken from the makers’ instructions:

1. Wash the door with mild detergent and warm water. Wayne Dalton suggests one cup of detergent with under 0.5% phosphate in five gallons of water. Never add bleach.
2. Scuff the surface lightly with a gray synthetic pad, not a green one, soaked in the soapy water. This lifts the wax and gives the paint something to grip.
3. Rinse with clean water and let the door dry fully.
4. Sand any spots of bare metal or rust, then coat them with a metal primer.
5. Tape off the windows, the weather seals and the handle or lock.
6. Paint a small test patch first.

The test is simple. Clopay says to paint a small spot, let it dry, and look for blisters or peeling. Then press masking tape on it and pull it off. If paint comes off with the tape, stop and fix the prep first.

Brush or spray both work. Wayne Dalton says brush strokes should follow the grain of each area. If you spray, it says several light coats beat one heavy coat, which tends to run. High humidity can stretch the drying time. On a muggy day, wait longer before the second coat.

Go easy with sandpaper on steel with a wood grain texture. Wayne Dalton warns it is easy to cut through to bare metal there.

Which parts of a garage door should you keep paint off?

Paint the door face and keep paint off the moving parts. Leave the tracks, rollers, hinges, springs and cables bare. Paint on these parts can make them stick. It can also hide wear that a technician needs to see.

Keep paint off the rubber or vinyl weather seals too. Tape them off, and leave the door open until the paint is dry. That way the fresh paint does not glue the door to the seals. If a seal is cracked or flat, change it first. Our garage door seal replacement guide shows how.

Do not paint over the labels inside the door either. That includes the warning labels and the wind load label. The next section explains why.

Does painting a garage door change its wind rating?

No, as long as the door itself is sound. Paint is only a surface finish. It does not change the steel, struts or hardware that earned the rating. In Florida, that rating comes from how the door was built and tested.

The proof is the label. DASMA says rated doors carry a manufacturer’s label certifying the wind load they meet. Clopay says the label shows the maker, the model, the design pressure and the test standard. Our page on hurricane rated garage doors explains how to read it.

Inspectors and insurers may want to see that label. DASMA notes that Florida insurers use a wind mitigation inspection form to set premium credits. Tape over the label before you start, so it stays easy to read.

Paint also never fixes a weak door. A badly dented panel should be replaced with a part that keeps the door’s approval. Our roller and panel replacement service handles that work.

How do you paint a wood or fiberglass garage door?

Wood doors follow different rules. Clopay’s wood finishing guide says to prime every side, then use a quality exterior paint. Match the base of both coats, latex over latex or oil over oil. Cedar and redwood need a primer with a tannin blocker to stop stains.

Humidity is the big risk with wood here. Clopay warns against finishing wood doors in very humid weather. In Florida, pick a dry stretch of days and work in the cooler hours.

Fiberglass faces a different problem. Wayne Dalton says UV rays wear down the clear top coat over time. It suggests a fresh clear coat every 12 to 18 months, or sooner in harsh sun. Its steps also call for taking the sections down. That means releasing spring tension, which only a trained technician should do.

For aluminum or full view glass doors, check the maker’s instructions before you paint. Each finish has its own rules.

How do you keep a painted door looking good in salt air?

Wash it often. Clopay says doors in coastal areas should be cleaned quarterly. Salt and dirt left on the door can lead to rust. Use mild soap and a soft sponge, then rinse well.

Skip scouring powders and solvents, which can harm the finish. Look for chips each time you wash. Touch up bare spots fast, before rust spreads. Our garage door maintenance checklist covers the moving parts.

Now you know how to paint a garage door the way the makers ask. Is your door too dented or rusted to be worth painting? Call Majestic Garage Door at (813) 774-1127. We answer 24/7 and check the whole door. We agree on the price before any work starts. If a new door makes more sense, see our garage door installation page.