"Ian Cornish" "icornish at talk21 dot com" wrote in message
...
I have metal window sills (newish house), but on some the builders seemed
to forget to seal the gap between the sill and the brick. This obviously
lets water in, and I guess will cause rust and untold other damage.
What sort of sealant should I use to fill this gap ? It's about 4mm
(sorry, I was born post decimalisation).

Ian

Usually just filled with mortar, but any exterior silicon will do.