How to repair cracks in plaster

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How to repair cracks in plaster

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Project Overview

Plaster walls can crack from time to time. We’ll show you how to plaster over a crack properly. You will learn how to prepare a crack before you plaster, and the best way to reinforce new plaster with jointing tape.
Continue to step-by-step instructions

Step by Step Instructions

1 Prepare the surface of the plaster crack
2 Cover the crack with plaster compound
  • Step 1. Prepare the surface of the plaster crack

    Scrape in the crack with your putty knife to open it up a little and give the plaster a bit more surface to stick to. Then sand around the crack to roughen up the paintwork. Now dust the surface down with a rag and cover the crack with a piece of jointing tape.
  • Step 2. Cover the crack with plaster compound

    Scrape the plaster compound into the crack and flatten it on to the wall with your paint scraper. Once the compound is dry, lightly sand it until it is smooth. Dust the wall off and apply a second, slightly wider coat of plaster compound to the wall. Again, let the compound dry, sand it smooth and dust it down. Now the crack is repaired and your wall is ready for painting.

Tools and Materials

Tools

  • Dust mask
  • Ladder
  • Putty knife
  • Safety glasses
  • Trimming knife
  • Wide blade paint scraper

Materials

  • Cork sanding block
  • Jointing tape
  • Plaster compound
  • Rag
  • Sandpaper
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