How to Do a Skim Coat With Joint Compound

A skim coat is a thin double layer of joint compound applied to a wall or seam. Textured walls or ceilings are often covered with a skim coat to even out the finish without replacing the drywall underneath. Drywall patches or repairs may require a skim coat to smooth the surface of the wall before repainting. The main goal when applying joint compound is to eliminate pitting and air bubbles. A thin layer of compound and a steady hand do the trick, but you'll need some practice before achieving the perfect finish.

Primer
Paintbrush or roller
10-inch drywall knife
Pre-mixed all-purpose joint compound
Pre-mixed topping compound
Bucket
Electric sander
Sandpaper

Instructions

- 1
  Apply a coat of primer over torn drywall and glossy or peeling paint. Allow to dry overnight.
- 2
  Load a 10-inch drywall knife with about a cup of pre-mixed all-purpose joint compound.
- 3
  Place the blade of the knife at the ceiling corner or top of the area to be covered. Pull the knife down the wall, pressing with moderate firmness. Spread the compound evenly over the area. Work in sections if covering an entire wall. Allow the compound to dry overnight.
- 4
  Repeat the procedure with a thin topping compound. Dip your knife into a bucket of hot water after each application and pull the knife over the applied compound to dissolve bubbles and smooth the surface.
- 5
  Fit an electric sander with 120- to 200-grit sandpaper and run it over the compound until smooth.

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