Drywall can be vulnerable to chipping and crumbling at the edges. Corner bead caps the places where two sheets of drywall meet, connecting them and protecting them from damage.
Corner beading comes in a wide range of materials, from vinyl, to metal, to plastic with paper-facing. They can be attached with fasteners like screws and staples, and are set with plastering adhesives like joint compound and embedding mud.
Source vinyl corner bead on Amazon or check out some paper-faced varieties, which are a little more expensive but easier to use.
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