How to Repair Damaged Plaster

What you’ll need

  • Drop sheets
  • Dust mask, work gloves and goggles
  • Scraper
  • Spray bottle with water
  • Bonding and sealing agent
  • Carrying board (to hold plaster)
  • Plaster
  • 100mm and 150mm broadknives
  • Sanding block
  • Primer and paint
  • Filling knife
  • Sanding float and abrasive paper


To repair a plaster crack, first move furniture out of the area and put down drop sheets. Wearing a dust mask, eye protection and work gloves, rake out any
loose material with a suitable scraper.


Dust the inside of the crack and lightly mist with water; wait until it’s absorbed. Mix a bonding agent; let dry. Apply the plaster and fill the hole. Sand when the plaster is completely dry. Spot-prime and paint.


To repair a hole, remove any loose or crumbling plaster with a scraper. Dust inside of the hole and mist with water; wait until it’s absorbed. Apply a bonding agent, and allow about 45 minutes to dry


Using a 100mm broadknife, fill the hole with plaster from the centre out to a depth just below the wall surface. Before the plaster sets, scratch surface with a filling knife to create a crosshatch pattern. Let dry.


Using a 150mm broadknife, apply a finishing coat (use skim-coat if available). Check wall is level and smooth. If necessary, apply another thin coat of plaster. Sand lightly with medium abrasive paper.

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