Begin your painting project by pouring thoroughly mixed paint into a bucket and dipping a quality 2"-2½" wide nylon/polyester brush into the paint.
Starting with a top panel of the garage door, paint into the recessed area of the panel. Begin at a corner of the recess and continue around its perimeter.
Continue painting the remainder of the panel until the entire panel is complete. Repeat the process of painting the panels and their recesses until all the panels are complete. Wipe away the excess paint that has overlapped onto the stiles.
With your brush, paint (cut in) around the perimeter of the garage door in a 2"-3" wide section. Start at the top corner and continue along the walls.
From the bucket, pour paint into a paint tray and work the roller into the tray until it is fully loaded with paint. For best results, use a 3/8"-3/4" roller cover.
With your roller, paint the stiles around the perimeter of each panel. Continue until the garage door is complete.
Again with your brush, paint the inside frame of the door starting at the top of the frame.
Continue until the door frame is complete. Wipe away the excess paint that has overlapped onto the trim.
Starting at a top corner of the door trim, paint the side edge of the trim where it meets the wall. Continue until all edges of the trim are complete.
Return to the top of the door trim and begin painting the face of the trim.
Continue until the garage door trim is complete.