Filling Holes & Cracks in Plaster

Plaster is a common feature of many modern homes. It’s great to paint on as it offers a smooth and clean surface. However, when damaged, it can be a pain to repair if you don’t know how. With a little preparation and time, even the most hideous of cracks, dents or holes can be made to look as good as new.

  • First, you need to prepare the area you are going to be working in. Place a dust sheet down in the immediate area.
  • Next, you need to ensure that all the loose material in the damaged area is removed. A Stanley-style knife is ideal for cracks. A pallet knife or scraper is great for dents and holes.
  • Use a vacuum cleaner to remove dust from the dent, crack or hole.
  • Next, spray or apply water to the area to moisten the section that you will be applying plaster to.
  • Mix the plaster to the manufacturers specifications and apply a good amount of plaster onto the wall, using a trowel to spread the plaster into and around the hole. Hold the trowel (or other appropriate spreading tool) horizontally but slightly angled towards the wall. Press the plaster into the area you are working and spread upwards, gradually spreading and flattening the plaster. You need to repeat this process until the hole is slightly over filled.
  • Once the area is fully covered in plaster, use your chosen tool and smooth the plaster to an even thickness.
  • Wait around 45-50 minutes, then go over the area with a damp towel. Rub lightly to ensure a smooth surface.
  • After a further 20-30 minutes, smooth over the surface again with your trowel.
  • If the damage is too severe for one coat of plaster, then ensure the first coat only half fills the damaged area, wait to dry and then apply a second or third coat.