On 17/03/2020 21:44, Mr Mark A Colfer wrote:
Have deeper than usual MDF internal window cill inside which was
previously (
badly) painted in old fashioned oil based gloss.Â* Had thought about over
laying a pvc cill but they're not made deep enough.Â* So question is
would it

How deep do you need? Our front window has one 18" deep, but IIRC, it
was 24" before I cut it to fit - it was some years ago.

SteveW