Reckon you will need 1 good tin of primer, 5 sheets of wet n dry fine to rough and at least two tins of paint to do the job and have a bit spare, please dont just spray staright on top of origional paint, also tack cloths.
Good luck.
Remember little and often ie thin coats let it dry thin coat/dry/thin coat/dry dont over apply you will avoid drips n runs preperation is the key, as dust free as possible, and wear a mask.:blabla: