I've used Turtle Wax Black Box with some success on my 11 year old (original paint) Integra GSR.
Black paint looks awesome, especially after a nice detailing, but it is a pain to maintain.
Sold the GSR and bought a white 07 Camry SE. Im not saying white is the easiest, I honestly dont know but it is a change for me.
btw with the black box i never used the spray, it seemed too much work and didnt do much of a difference.
First I used the filler (covers all the paint chips and scratches in the paint) then the wax (to make it shine) and it was awesome.