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How to Repair a Hole in a Plaster Wall: Part 2 – Applying the Patching Plaster

The video below is part 2 of a 3-part video series. You can also watch Part 1: Stabilizing Lath and Plaster and Part 3: The Finish Coat.

Rory was called to a circa 1900 home to repair a hole in a plaster wall. The hole was formed when a careless electrician used a sawzall to cut a space for a light switch. The vibration of the saw caused damage, resulting in an approximately 12″diameter hole that needed to be stabilized and filled in with new plaster.

After stabilizing the lath and plaster with Plaster Magic® adhesive, Rory was ready to move on to part two, which involved applying patching plaster. Using Plaster Magic®’s Patching Plaster, which is specially designed to be flexible and bond with existing historic plaster, Rory filled in the hole with a “rough draft” of sorts, also known as a “scratch coat.”

In this video, Rory will show you how to properly mix the patching plaster, which comes from our factory in powder form. The powder mix is combined with water until a peanut-buttery substance is achieved. It’s best to add water in small doses — you can always add more but you can’t take away.
Rory used a simple trowel to apply the scratch coat. He scooped small amounts and applied them gently, filing in any holes left behind by the drill when stabilizing the lath. Being a first coat, he did not spend much time making it perfect — that comes later. He then let it dry overnight before moving on to the third and final step: applying the final coat. You can watch that video in our next blog post.

Have more questions about repairs?