Z-5 Smells good and comes in a nice black bottle... Other than that it does just about nothing. 3M removed all minor swirlmarks and larger scratches.
Whatever you buy, get 4x the Z-6. I go thru about 4-5 bottles of Z-6 in summer. I never wash my car. I have owned it almost 3 years and it was washed once with Dawn and Zainoed. That was in 2001.
After that the California Duster and more Zaino has done the work!
Very happy, even if it is a lot of work.(initially, keeping up is no problem)
My 3M buffing took about 2 weeks, part time of course. I spent about 4 hours or more per bodypanel. Slow buffer and no cut thru. After that initial dosage was 5 coats of Z-2 with wiping Z-6 every 24 hour intervals.
Sounds like nuts, even my neighbour thought I was crazy. Then again, he drives a Honda, so what does he now.. After the buffing I could take the car under the neon and street lights and NO swirlmarks whatsoever. It was unbelievable.
This winter I will wash my car again and redo the buffing. Maybe even new 5 coats of Zaino!
Lauri