Answer by
worker5694 (130)
If you are painting them yourself, you can do so the best with three items: duct tape, a level, and a pencil. Figure out how far apart you want the lines and mark lightly with a pencil the two edges. Then with a level to make sure it is even, draw a line down the wall. Replace over this line with duct tape on either side of the stripe and paint the stripe in between.