The key with this kind of repair is making sure that the drywall patch is of equal thickness with the drywall used in the walls. Note that, in some cases, you may need to paint your whole wall to make sure your drywall patch is not detectable. Repair small holes by applying a drywall patch a bit larger than the patched area.
If you have to enlarge a hole in order to achieve a better look, use your drywall knife to make horizontal cuts into the hole - just be sure you do not dig more than about an inch into it. For smaller holes and popping nails, apply two to three thin coats of drywall adhesive using 4-inch-long drywall knives. Set a new piece in place and secure with 1-1/2-inch-long drywall nails, which have a very fine, flat head and are easier to hide in the joint compound than with drywall screws.
After cutting off any slack ribbon, put down a thin mat of drywall compound on each corner of the wall. Remove drywall to the remaining sides of a squared-off contour, using a box cutter to cut through the middle of a wall stud. Using a putty knife, place the drywall patch on top of the compound, sanding the edges past the patch into the wall.
Next, fill in the hole with either drywall compound or painters putty, using the putty knife to smooth the hole and level it to the walls surface. Peel off the protective covering to reveal the glue, and press the adhesive-backed aluminum drywall patch onto the wall right above the hole. Apply a bit of building adhesive to the exposed 1-by-4 face, then push in the drywall patch and attach it with a 1-by-4-inch piece of 1-by-4-inch shimmed against the studs and 1-by-4-inch piece of shimmed 1-by-4-inch wood. Start by placing the drywall mesh patch on top of the opening, then apply drywall cement to the patch and smooth over the edges.
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