I agree FoxBatKllr.
I tested four different metallic silver or aluminum paints next to Rub n' Buff on primed Sintra. Only one of the paints came close, but Rub n' Buff had the most realistic metallic shine hands down.
I'm a believer in Rub n' Buff now, but there's still a drawback that bugs me. Since it's a wax, it's very susceptible to marks. For example, if you bump into something or accidentally drag your fingernail across it, it leaves a line that needs to be buffed out. Sealing it with clearcoat will solve that problem, but then you lose the best advantage of Rub n' Buff... its amazing shine and finish! :facepalm