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How to cover up a bad wall
Apply drywall mud.
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.
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.