When painting a perfectly straight line (such as when you paint half a wall one color and the other half a different color) follow the steps below:
1. Paint one of the colors to a little over your approximate line of separation. Don’t worry about taping the line at this point. It is also a good idea to start with the lightest color first as it will be easier to cover up than a darker color. (we did it backwards in this example)
2. After the paint is dry put up your tape on your line. Then, in the first color paint, paint over the tape line on the side where the next color is going to go. This allows any bleeding of the paint through the tape to take place in the color it is supposed to be under the tape. Allow to dry.
3. Paint your second color, allow to dry and remove tape for a perfect paint line.