In this video, we learn how to cut a line using paint onto your walls. To do this you will need walls, a paint brush and your choice of paint. Make sure you get just the right amount of paint onto your brush and place the bristles against the wall right next to the corner of the wall. Slide it down making the line as straight as possible. Keep going until you have a line all the way down the corner, making it very straight and neat. Do this on both of the walls and you will a have professional looking paint job in no time.