From the sounds of it no matter which way you go it will be temporary paint!
Which type of primer did you use? Rattlecan or gun?
If you used rattlecan, go with rattlecan for the paint.
I bought an inexpensive gun for primer and a gallon of flat black (aka hot rod black now) from a local parts supplier, should not be an issue of the primer lasting or not, but on what type of environment it was laid in.
Good Luck! (I draw a vacuum at body work, but I can paint good!):color:
