I used similar paint to what you mentioned, Black magnetic paint base with waterbased craft paints over it ,then road markings and detailing. After painting I sealed it all with watered down white glue & the tape went on.I dont know how it compares to other methods cos its all ive tried so far but im happy with it. The magnetic paint was a waste of money though as it hardly changes anything! And I didnt paint into the slots with the magnetic paint ,just on top. The magnetic paint had 2-3 days to cure after I aplied a couple of coats.