How To Patch Up Walls Before Painting. To learn how to prime walls before painting them, scroll down! First, you need to remove the extra plaster from side cracks and dig it to make plain balance.
Start in the corners of the wall and up near the ceiling, cutting in the paint with an angle brush.
Just as important as choosing the right colour is preparing the walls. It is a good idea to wipe down the walls before you apply the primer. How to prepare your walls for wallpaper. Simple wall patches can cover even large holes, rendering the damage invisible with just a touch of paint a thin coat of primer onto the patched area with a bristle brush or a foam roller.