Make marking on cornices for corner joint.
Marked on the wall and ceiling using the cornices to prepare for corner joints.
Saw at the marked point of the cornice.
Apply adhesive along the edges at the back of cornices as wall as to the mating surfaces for joints.
Using Pressuure gun for nailing.
Adjust the joint for perfect match.
Ensure proper alignment on joints before nailing.
Apply filler to fill up gaps.
User sand paper to smooth the surface.
Wipe off excess filler.