It all depends of the issue and your goals. Here are some of the most common drywall issues. This is just an overview but will give you a good idea about how to repair damaged drywall. I hope it helps
Fix drywall holes:
To fix a small hole, fill it with vinyl spackling compound, but first slightly dent the surface with a hammer to produce a void. Clean the hole and dampen it with a sponge. Apply the compound with a 3-inch putty knife, drawing it smoothly over the dent, flush with the wall’s surface.
If a wall has a large dent or hole, the damaged area must be replaced with a new piece of drywall of identical thickness. The tricks involved in doing this well are 1) to fasten the new replacement piece securely, even where wall studs are not available for attachment, and 2) to blend in the new piece of drywall with the rest of the surface so it appears seamless.
How to fix peeling drywall
Drywall tape can peel for a variety of reasons—poor application, high room humidity, nail pops, even destructive kids and pets. You can make repairs easily, but it may keep happening unless you eliminate the cause, such as by placing a dehumidifier in a room where dampness persists.
If the problem is confined to a small area, you don’t need professional drywall skills to do an adequate job, but if the tape is peeling off the walls in several places, or in areas of prominent visibility, consider calling in a pro who can give you quality results. Do the following:
Use a sharp razor knife to cut away each end of the tape a foot or so beyond the damaged area. Sand down the remaining ridges of dried drywall compound with a moderately coarse drywall sanding pad. Sand almost to the drywall surface (you don’t want to go too far and cut into the drywall paper), and vacuum away the dust.
For damaged corners:
Use a utility knife to cut away loose drywall compound from the damaged area.
Reshape the dented corner bead. To sculpt flattened or bent areas, gently pound a bolt or an upside-down nailset with a hammer.
Tack down one edge of the loose metal corner bead with drywall nails.
Using a putty knife, remove all loose existing joint compound.
Tack down the other edge of the metal corner bead to secure it.
Using a 6-inch-wide drywall knife, fill one side of the corner and draw it out so that it’s smooth. Allow the compound to dry.
Fill the corner’s other side, smooth it out, and allow the compound to dry.
Gently sand with fine sandpaper wrapped around a block. Fill with a second coat if necessary and sand again.
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