[Bob G]

It is not the wax that makes the paint liquid looking as is the preperation to get it 98.%there. I do not like to use waxes with lots of petro chemicals that can dry out the paint. A good quality pure none cleaning carnauba paste wax will add that last 2% snap to the color of a black car.
Since I have been in this business black ,burgandy, British racing green and dark blues have always been a challenge to make look like a crystle clear pond of liquid water. I think the car care maufactors have also been trying to meet the enthusiast demands for this look and have come out with some very good products to choose from.
I will reframe from naming brands, but suggest the better ones are not on the counter of your laocal auto supply store.

Bob Geco