Chairs are the most common culprits for walls scrapes. Chair backs frequently bump and slam into smooth drywall, marring its finish and gauging into the surface -- especially when there are children in the mix. Chair-rail molding is a good idea in the long run for areas that see a lot of traffic. Until you get around to a more permant solution -- or the kids grow up -- a simple patch can make your wall look like new again.
1 Clean the area. You may be able to remove the mark entirely with a wet cloth and soap.
2 Spread a thin layer of drywall compound over deeper scrapes and gouges. Spread it as smoothly as possible, and don't use more than you need.
3 Allow the compound to dry completely before adding a second layer, if necessary. Apply the second layer in the same manner as the first.
4 Smooth over the patched area once it is completely dry by sanding it with a piece of medium- or fine-grit sandpaper.
5 Paint over the area with paint that matches the wall. If you do not have original paint, you will need to have the paint in the room color-matched at a home improvement store.