I am sure I posted this earlier but as it was not really car specific maybe it needed that info to appear.

Small scratch on plastic sill under door needs touching up. Not really noticable but on wife's car and I expect she will find it soon!

The Halfords kits look OK. Can anyone advise quick and simple treatment. Not really big enough to call out the professionals particularly as it not that noticeable.

Apologies if original post reappears.