Hey Sudesh, Zaino (Z2) works great for me on the outside black trim. I haven't had a problem with it in the past 3 years. I also keep my X in a heated/air conditioned garage and I suspect that helps too.

I use Zaino on the wood trim on the inside too and I top everything off w/Z6...

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'08 335i Coupe - Barbera Red / Saddle Leather / Light Poplar Wood / 6spd Manual
Options: Sport, Premium, Cold Weather, Comfort Access, Active Steering (awesome!), Power Rear Shade, IPod Adapter, Navigation w/IDrive
Mods: M6 Wheels, Split Armrest, M-Steering Wheel, Euro Light Switch w/Rear Fog Lights, Short Shift Knob w/Matching E-Brake Handle, Clear Reflectors, CDV, Clear Bra

Retired:'04 X5 4.4i