In article ,
sofadog writes:
Help my window sill (installed with upvc windows) is splattered with
hair dye. I've tried everything to remove it. Or should I try to
paint over it, if so with what?

PVC paints well with oil based gloss paint. You use top-coat only,
directly onto the PVC. The solvent in the paint actually dissolves
into the PVC surface, so the paint forms a permanent bond with the
PVC.

If the hair dye contains a solvent, it may be that this has carried
the dye into the PVC surface, which may be why you can't get it off.
Don't know much about hair dye, as would be obvious from my gray hair;-)

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]