It really depends on what "look" you like best. Sealents like Zaino or Klasse SG last the longest and have a very reflective look with little depth. They can be layered for additional protection. I've seen cars with over 16 layers of Klasse SG (great for the winter). Sealants like Poorboys EX, Carnuba Moose Wax or Blackfire II don't last as long as Zaino or SG and have a deep wet look very much like a good carnuba wax and can be topped with a carnuba like Pinnacle Souveran (looks great, doesn't last very long and is pricey) or Trade Secret. Either way it's the prep not the products that will makes all the differents. Streaks can be caused by several thing like an uneven layer of wax, poor polishing routine, appling certain waxes when the paint is to hot. Certain waxes will streak easier than others, for example P21S (S100) will streaks much easier than Souveran.

Zymol "Carbon" wax for black, I used it on my Audi A4. :thumbup:

http://www.zdoau.com/products/produc...php?pid=37&p=1

Will make the black look darker ;) ...best of all no dried white crap that you get with the cheap products.

Once you have used Zymol everything else gets thrown in the rubbish bin. :rofl:

I use Klasse AIO/SG then P21S with a PC.

I typically used Meguiars but used Zymol this time and I don't think I will use anything else. http://www.xoutpost.com/detailing-for...-clean-x5.html