The provided reference is insufficient to fully explain how to apply joint compound tape. It only mentions applying joint compound to corners after taping and mudding straight joints, and sanding after it dries. A complete explanation would require multiple steps. Here's a general process based on common practices:
General Process of Applying Joint Compound Tape
Applying joint compound tape, also known as drywall tape, is crucial for creating smooth, seamless walls. Here's a breakdown of the process:
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Prepare the Surface:
- Ensure the drywall is properly installed and securely fastened.
- Remove any loose debris, dust, or imperfections from the drywall seams.
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Apply the First Coat of Joint Compound (Mud):
- Use a taping knife (usually 4-6 inches wide) to apply a thin, even layer of joint compound over the seam. The purpose is to create a bed for the tape.
- Apply the mud slightly wider than the tape you will be using.
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Embed the Drywall Tape:
- Paper Tape: Place the paper tape centered over the wet joint compound. Use your taping knife to press the tape firmly into the mud, removing excess compound from underneath. Work from the center outwards to avoid air bubbles. Make sure the tape is flat and crease-free.
- Mesh Tape (Self-Adhesive): Apply the mesh tape directly onto the drywall seam, centering it carefully. Because mesh tape is more prone to cracking without a bed of mud, pre-filling the seam with mud is often recommended, especially for larger gaps.
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Apply the Second Coat (Embedding Coat):
- Once the first coat and tape are dry (usually 24 hours), apply a second, wider coat of joint compound over the tape. This coat should feather out the edges to create a smooth transition. Use a wider taping knife (8-10 inches).
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Apply the Third Coat (Topping Coat):
- After the second coat dries, apply a final, even wider coat of joint compound. This "topping coat" blends the repair seamlessly with the surrounding drywall. Use an even wider knife (10-12 inches or even wider) or a drywall taping box for large areas.
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Sanding:
- Once the final coat is completely dry, sand the surface smooth using a sanding sponge or pole sander with fine-grit sandpaper (120-220 grit). Be careful not to sand too aggressively, which could damage the paper tape.
- Wipe away any sanding dust with a damp cloth.
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Priming and Painting:
- Prime the repaired area with a drywall primer to seal the joint compound and provide a uniform surface for painting.
- Paint the primed area with your desired paint color.
Special Considerations for Corners:
- Inside Corners: Fold the paper tape along its center crease. Apply joint compound to both sides of the corner, then embed the creased tape. Use a corner knife to ensure a sharp, clean corner.
- Outside Corners: Use metal corner bead for durability. Apply joint compound to both sides of the corner and embed the corner bead. Then apply joint compound over the bead, feathering it out onto the drywall.
The provided video snippet only mentions applying joint compound to the corner after the taping and mudding is done, and the necessity of sanding the dried compound smooth.
