are you in the city ? if not push it out side and call a mobile sandblaster, plastic cover the car body and wshield very good . that will clean it to bare steel , then a self etch primer, then a good quality high build primer , sand and spray . that is the correct steps .as far a type of paint try to use a urethane .
i dont thin you can buy imron and if you get it , it will chip easy .
plus it stinks like hell.
hope this helps
kenny