How to Repair Plaster of Paris

Plaster wall

Plaster of Paris is easy to repair because it doesn't shrink after it has dried like regular plaster does. It is relatively easy to work with and usually dries within 24 hours. If the crack in your plaster of Paris is very small and thin, you need to make it larger before you repair it because larger cracks are easier to repair than small ones. After small cracks are repaired, they tend to reappear quickly.

Things You'll Need

• Work gloves
• Utility knife
• Bowl
• Plaster of Paris
• Water
• Spoon
• Paint brush about 2 inches wide
• Scraper
• Wood block
• Fine sandpaper

Instructions

1. Put on work gloves and take the utility knife to dig out a larger crack in the plaster of Paris.

2. Using a spoon, mix the plaster of Paris in a bowl with the correct amount of water as indicated on the package.

3. Take a brush and dip it into the plaster of Paris and paint it into the crack.

4. Use the scraper to smooth it over the crack. Allow to dry for 24 hours.

5. Use the fine sandpaper wrapped around a wooden block to smooth the repaired area into the rest of the plaster of Paris.

Tips & Warnings

• If after you sand the area it still doesn't look right, you can wet the area again with a wet paint brush and allow to dry again, sanding it again after it is dry.

• You must wait until the plaster of Paris is completely dry before sanding.

References

• Monster Guide: Repair Plaster