i am no expert but if car has been painted for 6 /7 months and the job was started 2 / 3 yrs ago i would not be surprised to see it rusting pretty soon. surely it all needs taking back and sorting properly. the reason i say this is the 3dr i bought was painted in primer in the engine bay and after about 8 months rust started showing through everywhere and i was told it was because primer can absorb water. mine didn't matter because it was going back to bare metal anyway. not what you want to hear but i would hate for you to spend more money and find it doesn't last.