Polish Car - Remove Scratches and Scuff Marks by Hand https://www.youtube.com/watch?v=eJ1SRuxBjn8 same principle just do it on small scale
Tamiya fine compound http://www.bnamodelworld.com/hobby-t...odels-tm-87069 car compound is expensive and cheaper one's will be too coarse
cutting compound is an abrasive and will remove paint/rub through paint if you rub too hard,you can use polish you would use on a car to finish off and remove light compound scratches