Where two or more outside corners meet, trim back the overlapping flanges of each bead to 45° mitered ends using aviation snips. The ends don’t have to match perfectly, but they should not overlap.
Fasten the first bead in place, then test fit each subsequent piece, trimming any overlapping flanges. Align the tips of the two pieces and fasten in place. Install additional beads in the same way.
Blunt any sharp edges or points created by metal bead at three-way corners using a metal file.
