Plastering External Corner of Window Reveal

I'm not skimming the plasterboard, so what's the best way of covering the corner edge of the beading?
Also should I use PVC or metal beading?
Alternatively I might use 1/2 inch timber for the reveal and caulk the hairline gap where the plasterboard butts up to it. This is what I'm doing for a doorway, but I'm covering the joint with architrave.
 
then there wont be any need to caulk
Thanks Danny,
When I bed the bead and coat over it, how do I cover the metal corner of the bead where the two sides of the mesh meet? Or does it barely project through the plaster and just get painted? I'm not skimming the boards.
 
Thanks Danny,
When I bed the bead and coat over it, how do I cover the metal corner of the bead where the two sides of the mesh meet? Or does it barely project through the plaster and just get painted? I'm not skimming the boards.

Yeah just paint over it :D

I use to polish them up on domestic jobs I use to treat them like picture frames :D
 
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