How to Mud a Corner Between Wood Walls

Measure the height of the corner between the wood walls with a measuring tape.

Cut the adhesive-backed drywall tape with a pair of sharp scissors to the correct length. This enables you to seal the corner seam where the walls meet.

Bend the tape in the middle to form a crease down the length of the tape.

Position the tape into the corner and smooth it in place with your fingers. Avoid any wrinkles while smoothing it in place.

Mix the drywall mud according to the instructions of the package.

Scoop out a generous portion of the drywall mud with a 6-inch joint knife. This tool is handy for applying the drywall mud to the corners and seams in between the wood planks.

Position the tip of the joint knife into the wood corner, holding it and the mud almost flat against the wall.

Press the drywall mud into the wood wall and pull the joint knife along the surface about 4 inches out to feather the mud. This helps provide a smooth finish and prevents bumps from the mud.

Repeat the process along the entire length of the corner using the joint knife and the drywall mud. Do this on both sides of the corner. Wait for the mud to dry according to the instructions on the drywall compound container.

Sand all sections of the dry mud with 120-grit sandpaper. Use a sanding block to do this.

Apply another coat of the mud after the sanding is done and then sand it again once the second coat is dry.

Add the final coat of mud to the entire corner and allow it to dry completely.

Sand the corner again, but this time use a 200-grit sandpaper and a sanding block. This provides a smooth surface to add primer and paint or wallpaper.