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Taping Inside Drywall Corners
1) Apply a base coat of mudd at proper consistency, to both sides of the corner angle with a 6" knife.
2) Fold the paper in half at the crease. This will cue in the inner edge.
3) With a corner knife embed the tape in the compound. Hold the corner knife up at a tilt, and not flat against the surface, and press firmly downward from the top to establish the right angle and progress in a single direction to prevent air traps. Quickly clean off the excess when the corner is run, with a straight blade knife.
4) When dry, take a blade at a steep angle with the wall and lightly scrape off any roughness of dried compound, in preparation for the next layer of compound.
5) Top coat with either a 8" or 10" straight blade. Clean off with the knife again, and reapply with the next wider knife width.
6) When thoroughly dry, sand smooth with a hand or pole sander.
For metal reinforced paper, follow the same procedure. You will find that the flexible metal backing lends structure to the corner and running the corner will have a higher build than paper tape. Either however must be folded at down the center.
Another bead material, paper backed rigid metal would follow the same instructions above with the absence of the corner blade and folding of the paper -- which brings to light its real advantage; the angle is pre-established at 90 degrees, leaving out most of the room for error in creating the straightness of edge, it's already done. This is a practical choice for novices without any prior taping experience.
Fibrous, flexible bead composites are taped similar to the above. But their real benefits are reaped in installing angles.
Yet another material, adhesive mesh, is best applied to non-corner applications with its lack of any preformed edge.
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