Uneven corners – At any level of finish, the corners of your drywall should be smooth and straight. There should be no crooked lines, gaps, indentations, bubbles or creasing. Badly applied tape can leave indentations and creases. A crooked corner bead can cause a wavy corner.
Tape showing through is normal as long as you barely sanded down to it. Tape doesn't sand as easily as mud so what can happen sometimes, is people sand down to the tape and keep going, so the mud around the tape is sanded down, but not the tape.
Apply a level 5 skim coat of joint compound
Applying a level 5 skim coat across the entire wall will remove the seam, and it is the best solution for hiding drywall seams. Using this method will require a professional to apply an eighth-inch layer of skim coat compound to cover the seams and holes in the walls.
Sand it smooth and if it needs to be re- mud it by putting on thin coats and build it up flush. Sand after it dries and prime. If there is anymore corrections go ahead and do and let dry and then sand. Re-prime and paint.
Leveling Up with Skim Coating
Skim coating is a technique used to create a smooth, even surface by applying a thin layer of joint compound over the entire wall. This process can effectively hide minor flaws and create a uniform appearance. This can effectively hide imperfections and create a seamless appearance.
Sand Taped and Mudded Drywall
After your third coat of mud has dried completely, it's time to sand and smooth the wall with 120-grit sandpaper. Although you can do this by hand, consider using a drywall pole sander to make the job easier.
Color Considerations
We all know that lighter colors emphasize imperfections while darker colors hide them. This also has to do with light and reflection. Lighter colors reflect more light while darker shades absorb it.
Although, if you have powdered joint compound or want to make your own, you need to mix the compound with water. Make sure you use a quick setting joint compound and mix it with water in a mud pan or other small container. You can mix the compound and water using the putty knife for patching over the tape.
Drywall absorbs moisture. If drywall sits directly on a concrete floor, it will wick up any moisture that is present in the floor, either now or in the future. Wet drywall has the potential to rot and flake apart. It also provides an ideal space for mold to grow.
With any drywall angle, you want to apply at least 3 coats of drywall compound to each joint: 1 to apply the tape. 1 to fill the joint. 1 to finish it smooth.
Signs of Water Damaged Drywall
Look for discoloration on the wall, often with streaks from the ceiling. Also, drywall that swells and changes color can show up as soft, bubbly spots. Mold and drywall damage often go hand in hand. Seeing mold, especially at corners and edges, means there's moisture in the wall.
A Pre-Drywall Inspection can identify potential problems with the framing, plumbing, and electrical systems in the home before it's too late. It's also a good way to get an idea of what repairs may need to be made at this stage of the building process.
One of the most common drywall mistakes is not having the proper edge support. Framing at inside corners is often inadequate or lacking altogether, making it impossible to fasten the edge of the drywall (left).
Drywall tape shows through the mud
If the drywall tape shows under the mud, the coating is too thin. Use three layers: tape coat, filler coat, and final coat.
DON'T overlap drywall tape
Apply a single layer of tape to lessen the chances of causing bulges and bumps in the wall.
Using a high-quality primer provides many benefits, including hiding imperfections and promoting adhesion. The KILZ Adhesion High-Bonding Interior/Exterior Latex Primer is perfect for surfaces that are difficult to paint, such as glossy surfaces, vinyl, and plastic.
Use a push-pull motion with a pole sander or hand sander to apply pressure along seams, nail and screw patterns and even pressure. To smooth out rough areas, use semi-coarse paper of 100 or 120 grit. Next, add 150 grit. For finishing drywall sanding, use sheets of sandpaper.