How To Repair Damaged Plaster

May 25th 2016
How To Repair Damaged Plaster


Cold Chisel


Utility Knife

Soft Bristle Paintbrush

10” Wallboard Knife

150 Grit Sandpaper



Latex Bonding Agent

Mortar Cement

Joint Compound

Interior Primer



  1. - Make sure that there are no leaks in the area of the damaged plaster. If there are any, fix them and allow to dry for a couple of weeks or after next rainstorm.

  1. - Prepare the room for work by protecting the floor with a plastic cover, take all the paintings off the wall and remove furnishings. Remember to tape around the doors to minimize the dust throughout your home.

  1. - Gently chip away at the damaged plaster using a cold chisel and a hammer.

  1. - Using a utility knife, cut along the chipped inside of the edge until the edge becomes smooth and straight.

  1. - Using a wide, soft bristle paintbrush, apply latex bonding agent onto the edges of the hole and onto the lath.

  1. - Apply 1 cm (in thickness) of mortar mix using a 10” wallboard knife. Remember that the first layer needs to be cross-scratched when it begins to set; this will help the second layer to stick better.

  1. - Allow 24 hours to dry.

  1. - Spray the first coat with water and using the same knife, apply ½ cm (in thickness) of mortar cement of the second coat and remember to cross scratch.

  1. - Leave to dry overnight, 12 hours minimum.

  1. - Using the 10” knife, apply the joint compound. Swipe the compound towards the edges evening it with the rest of the wall. Allow to dry for 24 hours.

  1. - Wet sand the area using 150 grit sandpaper until the area becomes completely even.

  1. - Use the soft bristle brush to apply a coat of interior primer and allow to dry for 4-5 hours.

  1. - Complete the project with the final coat of paint.