Nudura internal window cill

[BotusBuild]

In the picture you will see the opening for windows created in Nudura walls. As I approach plaster boarding, thoughts turn to the traditional wooden window cill at the bottom of each window.

 

Am I safe to presume that I can attach the cills directly to the Nudura, with nothing else in between.

[Russell griffiths]

I found that scratching it up and putting a coat of render on them, then any glue you use will stick better.