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Painting all of the edges in the room, also known as “cutting in,” should be done before painting the walls entirely. Use an angled paint brush to carefully paint the corners and edges. When cutting in, paint a strip along the edge that is 2 inches (5.1 cm) to 3 inches (7.6 cm) wide. To reach the top corners of your tall wall, use strong tape to attach your brush to the extension pole. The pole should be long enough that you can paint without having to use a ladder. If there's edging that needs to be done using a tall ladder, have someone hold the ladder while you're at the top for safety. Paint edgers can be used with an extension pole or by themselves, and they're great for painting clean, straight lines without using tape. Simply slide the edger along the wall's edge, and it should apply paint in a clean line without getting paint on the opposing wall. You can buy an edger at your local hardware store or online, and they usually cost less than $10. How long it takes the paint to dry will depend on the type of paint you're using. In most scenarios, your paint should be mostly dry after 1 hour, and the walls should be ready for a second coat after 4 hours. After the edges you painted are all dry, it's time to add a second coat. Try to paint nice, even coats so that you won't have to go back up the ladder to do touch ups later on.
Cut in the edges of the walls, doors, windows, or trim. Attach the paint brush to the end of an extension pole to reach tall spots. Use an edger attached to an extension pole for clean lines. Wait 4 hours for the edges to dry. Apply the second coat of edging.