I have lowered my bathroom ceiling by about 80cm as it was a very strange shape being long, narrow and over 3M high.

This photo

https://www.dropbox.com/s/42b75ey1iy...hroom.jpg?dl=0

shows the window reveal where there's the new plasterboard ceiling which butts up against the the glass of the window.

Whilst lying in the bath looking up at it it occurred to me that it might look better if there were a strip of white plastic glued along the window where the plasterboard meets the glass - it'd make it look less obvious that the ceiling is part way up the window and more like it was meant to be like that as there'd be more of a "frame" effect for the glass.

I'm wondering what people think and what sort of plastic would be suitable - so far I have considered the lid of a length of mini trunking about 3cm wide