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Ensure the drywall surface is clean, dry, and free of dust. The corner can be installed using either glue or joint compound, depending on your usual working method.

Apply glue directly onto the wall surface or onto the back of the plaster corner.
If using joint compound, coat the inner corner evenly by dipping it into the compound.

OR

Dip the inner corner into the joint compound.

Place the interior corner directly onto the drywall. Press firmly along the full length of the corner so it sits tight and aligned with the wall angle.

Remove any excess joint compound using a trowel or spatula. Smooth the surface as needed to blend with the surrounding wall.

Once dry, the interior corner is ready for finishing and painting, providing a clean, precise, and durable angle.