Thank you for your response. I'm not sure if I used the correct terminology. It's the recessed bit of wall to the side and top of the windows that I'm enquiring about. I will gloss the cill after painting the walls.
Apologies, should have made it a bit clearer - If you are keeping the surrounding wall and reveal the same colours then generally you would paint the window reveals first and any other reveals, doorways, alcoves etc and then the walls
If they are going to be different colours then best to paint wall first and then do the reveal so that you get a nice crisp finishing edge to the reveal.
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