Gaps above windows

[dr_bogenbroom]

Discovered upon inspecting the windows outside that 2 small windows have big gaps at the top. I was thinking of just using some sealant/adhesive to attach a piece of quadrant to but not sure if this would look naff?

 

[crank39]

Foam it then seal it

 

[dr_bogenbroom]

Foam it then seal it

Expanding foam? And what should I seal it with?

 

[crank39]

Low modulus neutral curing silicone

 

[dr_bogenbroom]

Low modulus neutral curing silicone

For a minute there I though this was a tartan paint moment - much appreciated thank you