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Select a shade you like. Apply a primer to help the fresh paint stick. Detail the smaller areas with a brush. Roll on the new coat of paint. Allow the paint to dry for 12-24 hours.
Shop around for paints in different colors that you think might suit your garage door. Be sure to only look at paints that are specially formulated for exterior use. For most garage doors, lighter shades like white, beige or pearl will work best because they won’t fade as much in the sunlight.  In general, it’s a good idea to match the color of the garage door to the color of the house itself. A contrasting trim color will create the look of depth around the door.  Stick to a color that’s similar to the one you’ve been using, or take the opportunity to explore new tones that change the overall aesthetic of your home. The primer will both provide a flat base for the paint and make for greater durability, allowing it to hold better over time. You’ll only need to use one thin coat of primer. Make sure the primer is dry to the touch before you attempt to paint over it.  Those who are planning on touching up their garage doors in the same shade can dispense with a separate coat of primer. It may be helpful, however, to purchase a paint that includes a built-in primer to ensure the color comes out the way it’s supposed to. Allow the primer to dry for at least 12 hours. Begin by painting the hard to reach recessed portions of the panels with a handheld brush. The narrow width and manual control offered by the brush will enable you to penetrate deeper into crevices and molded depressions. Work slowly and carefully, painting each of the inner panels one by one.  Look over the door to make sure you haven’t missed any thin or bare spots. Depending on the color and general condition of your garage door, you may need to use multiple coats to achieve a solid finish. After you’ve painted the recessed inner panels, use a wide paint roller to cover the broad outer surface of the door. Painting with a roller is quick and painless compared to manual brushing. A roller also guarantees a consistent finish, and won’t leave behind any visible strokes or seams. Paint with long, steady motions, overlapping the rough edges of each stripe.  For most basic paint jobs, a single coat of paint will usually be enough. If you're switching to a bolder shade or painting a lighter color over a darker one, it may be necessary to use multiple coats in order to get the color to show up. Let each coat dry for roughly 12 hours before applying additional coats. Set the door’s action to manual and raise or lower it as needed to paint a specific area. This will prevent the discomfort of being forced to crouch, stoop and stand repeatedly. Plan on allotting at least one full day for the paint to dry to the touch. During this time, it’s best to leave the door in a closed (down) position so that it can receive plenty of airflow. Resist the urge to touch the drying paint, and keep cars, bicycles, tools and toys at a safe distance.  Though the paint will usually harden to the touch in a matter of hours, it may take as long as a week for it to completely cure. It may be necessary to park your car outside while the garage door is drying.