Hi, awesome Merc that , as for the PE set i use superglue, with a very very small applicator, take your time and you will get good results
With the PE badges i would say to leave them on the sprue and paint them , let them dry then use a fine sander and keep them as flat as possible and rub away in one direction it will take the paint off on the raised areas and leave the paint in the lower parts, it realy sets them off