How to Skim-Coat Walls

A new approach for smoothing rough walls that's easy to master

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Introduction

Smooth over rough or damaged walls with a skim-coat of mud, applied with a special squeegee knife. It's easy to do and delivers great results.

Tools Required

  • 4-in-1 screwdriver
  • Mud pan
  • Paint roller
  • Paintbrush
  • Roller sleeve
  • Safety glasses
  • Sanding pole
  • Squeegee knife
  • Taping knife

Materials Required

  • 120-grit sandpaper
  • Drywall compound
  • Masking tape
  • Primer

How to Skim-Coat Walls

If you’re a skilled drywall taper or plasterer, you probably use a hawk and trowel to skim-coat walls. We don’t expect to change your mind if you use those tools as second hands. But if you’re a remodeler who does only occasional skim-coating to fix wrecked walls, you know it’s a tough skill to master. Plus, here’s how to choose the right joint compound for your project.

The method we show isn’t faster than traditional skim-coating — you have to do two or three coats and let each one dry in-between. But it’s idiot-proof, and the walls will end up flat and smooth. So if you’re a contractor who’s given up on skim-coating and you always call in a taper for the task, you can save on labor by tackling it yourself next time. It only takes a regular paint roller and a squeegee knife. The 14-in.-wide squeegee knife we used is called a Magic Trowel.

Before you start on this project, if you’re having some issues with your drywall check out this video:

Project step-by-step (6)

Step 1

Start by Prepping the Walls

  • With this method of how to retexture a wall, you don’t just spot-prime; you roll the entire wall with a stain-blocking sealer.
    • Pro tip: If you’ve always used solvent-based sealers like traditional BIN and KILZ, it’s time to try one of the water-based stain killers. Zinsser’s Bulls Eye 1-2-3 primer works well, and you’ll avoid any griping from your customers about the smell.
  • Roll a fast-drying, stain-sealing drywall primer on the walls. The primer seals loose paper and promotes better adhesion of the joint compound.
  • These are thin layers that won’t fix holes or torn-away paper, or make uneven sections level. Patch these problems with setting-type joint compound.
  • Let the compound harden (it doesn’t have to be dry) before you start skimcoating.
  • Don’t rush on to the next step; let the sealer dry thoroughly before applying any joint compound.

skim coat paint primerFamily Handyman

Step 2

Roll on the Mud

  • Mix all-purpose joint compound to about the same consistency as mud you would use for bedding tape (the consistency of mayonnaise, or just thin enough to roll on the wall).
    • Pro tip: You’ll get shrinkage if you mix it too wet.
  • Spread a layer of slightly thinned all-purpose joint compound on the walls with a heavy-nap roller.
  • Work in small sections so you can smooth out the joint compound before it starts to dry.
    • Pro tip: Don’t worry if you get cracking on the first coat; just mix the next coat a little thicker by spooning in some fresh mud from another bucket.
  • Use a 1/2-in.-nap roller to roll mud on an area about four feet square.
    • Pro tip: Try to keep it as even as you can so the squeegee work will go better for you.

Roll on the MudFamily Handyman