Can you paint over black urethane primer and make it shiny?

You know how primer goes on a car first then the real (good) paint goes on. Well if black urethane primer is called primer then can you put a gloss on it or what ever to make it a nice black.|||Since your painting it black already and not a light color it will be very nice and glossy. You will be very pleased with the darkness and glassy appearance.|||you would have to put on several clear coats for it to look good, but it will never look glossy...