There are many good videos on YouTube that explain how to repair minor paint damage such as crazed/lifting or otherwise damaged clear-coat lacquer, this one covers a similar repair to what you've described :
https://youtu.be/lbSIjsUeWZQ
As for the gearbox, do 3 or 4 "part-changes" (aka "sump-dumps") of the ATF using this stuff :
https://www.ebay.co.uk/itm/Carlube-A...QAAOSwBEpZpY7F
Not sure what the capacity is on yours, someone should be able to tell you but i'd guess in the region of about 3L so if you buy 2 of those it will probably be enough for 3 part-changes. Do them about a month apart then do one a year thereafter.
Doing it this way is beneficial for a whole number of reasons, one of which is it introduces the new, thicker fluid more gently than the "flushing method" and uses less fluid overall. It's also more effective at removing dirt from the box which helps to keep the filter cleaner as well.
After the final part-change out of the 3 or 4 you do, reset the fault code memory on the gearbox ECU (and preferably the engine management ECU as well) and you will be surprised!
