You can save a lot of money when mudding corners by doing it yourself instead of hiring a professional. Mudding corners is not hard to do, and if you take your time, you can do a superb job yourself using a few common tools and a bit of skill. You will need paper or mesh tape, your mud, a joint knife, and a sander and sand paper to complete this job.
The first thing you will want to do is to tape the corners. Saturate your paper or mesh tape with mud, center it evenly along the joint and apply with care being sure to remove any bubbles and excess mud. You can use a banjo tape dispenser to apply the tape. This feeds the tape more evenly and also saturates the tape with mud better than if trying to lay the tape by hand.
When mudding corners, you must make sure that the tape is even and bubble free. This will ensure a smoother finish once you apply your mud. Also, make sure to center your tape evenly along the corner for a smoother finish. If you do not apply enough mud to the tape it could peel from the wall as you mud the corners, so be sure to saturate the tape well.
Mudding The Corners
You will need a joint knife (L shaped knife) to apply your mud. Apply a bit of mud to the knife and smooth the mud along the corners evenly. You will want to apply a very thin layer of mud, pulling the knife slowly down the corner. This is all you need to know when mudding corners, knowing to apply a thin layer evenly over the tape. You may find it easier to start the application if you hold your knife at an angle, while letting the mud flow downwards from the wall to the floor.
You will need to apply more mud to your knife as you continue along the corner. Mudding corners takes patience; so do not rush as you apply the mud. Once you have the first layer of mud applied, you will want to add two more very thin layers being sure to smooth the mud evenly as you apply each layer.
Allow the mud to dry thoroughly between layers so that the mud does not flake or chip. If the mud starts to flake or chip then you should allow more drying time as this will make it harder to sand the corners with a smooth finish.
Sanding And Finishing
Allow 24 to 48 hours for the mud to dry completely and then prepare to sand it. When mudding corners properly, you should not have much left to sand. Sanding will produce a smooth finish that blends with your wall well. To sand the corners, first sand the mud along the wall, being careful that you do not sand so much as to shred the tape. If the tape starts to show, you will need to apply more mud.
After sanding the wall, you will want to sweep away all excess dust and then sand the floor and joint. You may find it difficult to sand the joint. To make this task easier, you can wrap sandpaper around a square block of wood using the corner side of the block to reach the joint.
When the task of mudding corners is completed, you may then paint over the mud. If you did the job properly, the finish should be smooth and unnoticeable.