markeb01 is dead on, uncatalyzed primer is nothing but a sponge.
Ugh!!! this just won't go away... I have seen so many decent cars killed by "saving it (for now) with primer".
If you must get it one color for now, I would suggest a catalyzed primer. You can even tint it... go to your automotive paint store and ask about your options.
If you can find a way to schmooze her into keeping the patina, just give it the CLR treatment and wax it.
IMHO, painting this one would be a crime.
