When painting, to get the metal shiney look to it, you must first make sure that the surface you're painting is completely smooth. By that I mean buff the heck out of your surface until you can see yourself in it. Otherwise, no matter what kind of paint you put on it will come out looking dull because the initial surface below wasn't smooth to begin with. I suggest stripping the paint you put on it so far and then go back over your surfaces and sand and buff them until all of them shine. It's quite possible you missed a spot before painting... it's happened to me, that's why I know what you're going thru.