Fast drying time.
For a textured wall, corners can be taped in one pass. To
use UltraFlex, for example, you fold the tape at the center and
trowel it into a bed of compound that has been thinned with
water; then wipe down the narrow flange with a finishing knife,
leaving most of the tape exposed (Figure 2).
Figure
2. As with conventional paper tape, UltraFlex is pressed
into a bed of compound (top) and set with a taping knife
(bottom left). But that’s where the similarity ends: Only
the edges of the finish paper, which extend beyond the plastic
backing 1/4 inch, are covered with a feathered coat of compound
(bottom right). For textured walls, the corner can be painted
after the mud dries; a smooth finish requires a second feather
coat.
Immediately apply a feather coat, again covering only the
1/4-inch paper flanges, and when the compound is dry the corner
is ready for paint. A smooth wall finish requires a second
feather coat at the paper flanges.
Both UltraFlex and UltraCorner are easy to align over the
corner, and because both the bed coat and edge coats are
comparatively thin, outside corners require much less time to
dry than corners trimmed with metal bead. Both of these tapes
also have a much flatter installed profile than conventional
metal corner bead. This reduces the amount of standoff created
at the baseboard — a distinct advantage when dealing with
stain grade trim.