Angle Beads, bonding and finishing plaster on a chimney

[Possom]

The front two external corner vertical edges of a standard traditional chimney stack in a living room has been coated in mortar (sand/cement).

If wanting to add an angle bead along the two vertical corners in conjunction with the bonding plaster and finishing plaster: would you:

a) attach angle beads, then apply bonding plaster, the apply finishing plaster - or -
b) apply bonding plaster, attach angle beads, apply finishing plaster

 

[Wayners]

Either.
If building out with bonding use the one pictured.
For a thinner coat of bonding use thin coat beads after with the multi

 

[23vc]

As above, but I’d personally always do a). Slightly better job imho, can get the bead bang on plumb at that stage and not rely on dubbing out a skim bead

 

[23vc]

And if doing a), cut back the bonding along the bead aris a little bit before skimming

 

[Mottie]

When I've watched my plasterer mate doing plastering for me, I’m pretty sure he flops a few dollops of plaster on the corners and then sinks the angle bead into that, tapping it and using a spirit level to get it straight.

 

[23vc]

Yep.