[kyriian]

Zaino has worked well for me for the past 10 or so years, i am still using it on the Z4M, but it takes a lot of time and patience to do it right.

Klasse I have used, it is fairly picky on application though, too much and it will streak pretty badly, but it seems to last even better than Zaino.

My beater now is using McKee's 37 SIO2, and for a car sitting outside all the time I would say it works well for about 6 months, but i only do it once a year on the beater.
Application is dead easy and I can do it in one evening for one coat, which is already sufficient for 6 months.