Your going to get a lot of different answers here. There is a plethora of great waxes and sealants for black cars. One of my personal favorite combos is PoorBoys EX and ClearKote Carnauba Moose Wax. Makes for a nice deep wet looking finish. As others have stated there is other stuff. Pinnacle Souveran looks phenominal on black cars, but its a bit pricey.