Ok first you must realize that I am not a shine nut. My wife's black VW has been driving me nuts though. The black paint seemed to have a film on it that sort of made it look cloudy. I tried polishing compound to no avail. I tried many different Walmart waxes - Turtle (various kinds) Excaliber etc etc over the last two years - the filmy appearance was still there along with bad swirl marks. I decided to live with it.
On the week end I decided to try Meguire's Gold Class - it said satisfaction guaranteed - return unused portion for refund. The advertising on the package said (roughly) We aim to give the consumer more than they expect-our best shine in 95 years. Well - I am sold!! I washed the car and dried it. I applied the wax with applicator supplied and let it sit for 1/2 hour (cloudy day). I then took the Wen polisher and started to buff. The polisher seemed to work a little as it bit into new dried wax - BUT WOW!!! - all sorts of black stuff came off on the terry polishing cloth and the shine it left was incredible! I was going to go over the car with the lambswool pad - but it didn't need it! The swirls disappeared and only a few scratches still show - but the car looks 10 years newer (not bad considering it is a 1994!). Only used 1/3 of the bottle of wax and got far superior results to any of the other products I have tried - with and without buffer.
I highly recommend Meguire's Gold Class liquid for Clear Coat - it really did a job for me. You diehards think Zaino will work better? I might become a shine nut with results like this!!