At some stage, I will attempt to paint some of my 3D print creations. I have gathered a few links with information on painting PLA plastic. I hope the links are of some value to you.
Update: I am also about to purchase a kit named Modifi3D http://modifi3d.co.uk/ there are a number of video reviews on YouTube from 2016. This tool allows you to cleanup the model after printing. It is like a soldering iron, with different tips to cleanup/sculpt the model.