I did the skirts on my 99 myself. Get some colour matched paint in a spray pack,
look under your bonnet for the colour code. Mine was 74F for
WRC blue.
1. Remove the skirts, clean them VERY well.
2. Give a light sanding so the primer has something to stick to.
3. Prime with a plastic primer.
4. A few coats of the colour matched paint.
5. Seal with a clear coat.
Because side skirts are generally not in an impact zone (ie, not like the front
end where it is subjected to direct hits at high velocity from rocks etc) then
you should be ok for chipping.
Save a heap, do it yourself.