[header] How to cover up a bad wall [title] Apply drywall mud. [step] Drywall mud is fairly easy to work with, and you can give the mud an interesting texture after putting it up to hide any imperfections in your wall. [substeps] Grab a bucket of ready-made drywall mud and apply it evenly over the surface of the wall with a 6-inch (15-cm) putty knife. 
The coat should be between 1/8 and 1/4 inch (3 to 6 mm) thick, depending on the severity of damage. You can apply texture in a variety of ways.