Figure 5-10.—Finishing an inside corner.When finishing an inside corner (fig. 5-10), cut yourtape the length of the corner angle you are going tofinish. Apply the joint compound with a 4-inch knifeevenly about 2 inches on each side of the angle. Usesufficient compound to embed the tape. Fold the tapealong the center crease (view A) and firmly press it intothe corner. Use enough pressure to squeeze somecompound under the edges. Feather the compound 2inches from the edge of the tape (view B). When the firstcoat is dry, apply a second coat. A corner trowel (viewC) is almost indispensable for taping comers. Featherthe edges of the compound 1 1/2 inches beyond the firstcoat. Apply a third coat if necessary, let it dry, and sandit to a smooth surface. Use as little compound as possibleat the apex of the angle to prevent hairline cracking.When molding is installed between the wall and ceilingintersection, it is not necessary to tape the joint (view D).When finishing an outside corner (fig. 5-1 1), be surethe corner bead is attached firmly. Using a 4-inchfinishing knife, spread the joint compound 3 to 4 incheswide from the nose of the bead, covering the metaledges. When the compound is completely dry, sandlightly and apply a second coat, feathering edges 2 to 3inches beyond the first coat. A third coat maybe needed,depending on your coverage. Feather the edges of eachcoat 2 or 3 inches beyond each preceding coat. Cornerbeads are no problem if you apply compound with careand scrape the excess clean. Nail holes and screw holesusually can be covered in two passes, though shrinkagesometimes necessitates three. A tool that works well forsanding hard-to-reach places is a sanding block on anextension pole; the block has a swivel-head joint.Figure 5-11.—Finishing an outside corner.5-10
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