I've got two black Stangs, and on the gloss one I've used hard shell from turtle wax. I do it about once a month, and I've had no problems with it. Takes me maybe an hour to do. However, she is not a show car, nor was the paint in great shape when i got her. But I do get a lot of compliments of how shiny she is
There's TONS of opinions and choices on this, so choose what works for you. But I recommend you keep it simple.