uPVC window sills damaged by paint stripper?

[ToolbeltDandy]

A couple of years ago, mum had someone repaint the front of the house. The old white paint was flaking away to the red paint underneath. There is damage to the window sills, even though the painter covered them with masking tape. We presume that this was caused by paintstripper, but don't know for sure. Is there any way to make the window sills look good again?

The damaged patches are rough to the touch and are slightly depressed (i.e. they're something missing rather than something added which can be scrubbed off).

 

[Bosswhite]

Its probably worth cutting out the original sill and replacing,
a 5 metre length of sill would cost about £30 depending on type. Silicone and UPVC beading would help to cover up any gaps, look like new again.

 

[ToolbeltDandy]

Hi. Thanks for the advice. Can you tell me how to begin removing the old sill? Most the information I find, despite searching for uPVC-specific information, covers repair of wooden sills. Is this held in place by screws or mastic or both? Can it be removed without disturbing the window/window frame?

 

[Bosswhite]

Hopefully this link will help.
Going by the picture it looks like there is 3/4 bead to cover the gap between the sill and window frame, unclip that,(or carefully cut away) replace sill, silicone bead fill and replace bead

http://www.howtospecialist.com/indoor/how-to-install-a-window-sill/