render curved external wall - how to achieve 90degree edge?

[wads]

Hi,

I've got a small curved garden wall that forms the boundary to a raised flower bed. The wall has been built with landscaping bricks with random relief. I want the wall to be smooth so I am in the process of rendering it.

My question is how do I achieve a true 90 degree arris/edge of the top and front edge of the wall? If the wall was straight I guess I would simply use a corner bead but since the wall is both convex and concave I'm not aware on any corner beading products that are designed to bend.

many thanks
wads

 

[jbonding]

use plastic render beads and a bit of jiggery pokery

 

[marshman]

lightly nail some boards on top of the wall and finish up to these, as soon as you have floated pull nails and slide the boards off away from the render. touch up top edge.