To skim coat a wall, prepare the wall by applying primer and then roll on a thinned mixture of joint compound. Smooth the compound and apply a second coat to create the smoothest finish possible.Continue Reading
Paint the wall with a fast-drying primer to seal stains and loose paper. Primer also helps joint compound adhere better to the walls.
Mix all-purpose joint compound so that it has the consistency of mayonnaise. Working in small sections of about 4 feet, spread an even layer of the compound on the walls using a 1/2-inch heavy-nap roller.
Smooth the joint compound with a squeegee knife, starting in the top corner and pulling down. Overlap every vertical stroke, wiping the blade with a damp rag after every few strokes to keep the compound from building up.
Apply at least one more layer of joint compound, applying the second coat horizontally. Add a third level if necessary to create the smoothest surface possible, which minimizes sanding.
Once the last coat of compound dries, sand the wall using a pole-sander outfitted with 120-grit sand paper. Continue sanding until the wall is perfectly smooth and even.