I have about 4 coats of the new Blackfire formula on my car and use ClearKote QuickShine QD and it works great. It makes the Blackfire surface very slick. It's better than Meguiar's Final Inspection.
Duragloss FC (#921 - Fast Clean & Shine) - available locally.
All three work and compliment the BF2 finish. I give the slight edge to Z6. The fact that all three of these products include a polymer re-enforcement upon application tends to really help maintain gloss, depth and micro-marring filling. All three are also easy to apply and buff using very little product $$$.:xyxthumbs :wavey