How to Repair Damaged Plaster
Step-by-step DIY guide on repairing plaster cracks and holes in your walls or ceiling.
What you'll need
- Drop sheets
- Dust mask, work gloves and goggles
- Spray bottle with water
- Bonding and sealing agent
- Carrying board (to hold 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.