Mix together one tablespoon flour, one teaspoon salt, and a few drops of water to form a paste. Apply the mixture heavily to your cardboard patch so that it oozes around the square’s edges and binds it in place to the drywall. Allow the paste to set, and then pull out the string.
Priming the wall seals the joint compound, which has a different texture than the rest of the wall and absorbs more paint than the drywall. Priming blends the joint compound and the drywall, so the surface is uniform. Use a primer designed for painted walls. Apply with a paint roller and use a brush for smaller areas.
How to Patch Drywall. Patching drywall is often a top concern when preparing for a move. Drywall is vulnerable to cracks, dents and holes, but you can easily repair it with drywall joint compound and a little sanding and painting.
Small holes can be patched over with drywall tape or a self-adhesive drywall patch, but large holes need a more rigid material to span over the larger opening. … Once the patch is in place, tape and “mud” (apply joint compound) over the seams, just like when installing new drywall.
Your filler options
Powder fillers: these are mixed with water and harden by crystallisation and so set quickly right to the back of the hole. This makes them more suitable for filling deep holes. Unlike plaster, the powder left in the box will still be usable when you find another hole to fill months later.
Patch up cracks and holes in your walls with homemade spackling. That’s right, hidden in your kitchen, you’ll find a cheap way to repair your walls. Mix together four tablespoons of white flour and one-third teaspoon of salt, then add in enough paint or primer until the concoction has a doughy or putty-like texture.
It will hold and dry even at odd angles. Use caulk if cracks appear where the ceiling meets the wall. Caulk is flexible and can withstand a slight bit of settlement. Sand, prime and paint the wall after you’ve repaired the crack.
Homemade Joint Compound
Mix a tablespoon of flour, a teaspoon of salt and a few droplets of water in a small container. Mix thoroughly until it forms a paste and apply to the hole or crack as you would joint compound. Use a putty knife or index card to remove the excess while it is still wet and allow the rest to dry.
I moistened the edges of the exposed drywall with a bit of water, then added a bit of Gorilla Glue. Gorilla Glue expands in the presence of moisture, so it will fill the voids left in the wall between my patch and the hole.
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