The product your using, Gold Class does produce a pretty good shine but doesn't last that long, same for the NXT. I'd use the NXT about every 3 weeks as it doesn't last long at all, but is very easy to use. Now if you don't want to/and or have the time to give your car this much attention and its black, here's what I'd use especially since its new:

- thoroughly wash the car
- clay bar
- Klasse All in One
- Klasse SG, followed by another coat 8 hrs later
- Pinnacle "Souveran"

I'm sure your going to want to use up the GC and thats fine, but when you get something else, give my formula a try. If you've got any questions, PM or email me, I'm always willing to help out.