I left it on for about 10 minutes. One direction you should definitely follow is to make sure the surface is cool.
I did as the directions said too. I put it on the car and left it on while I went to get the mail. As an experiment, I put a small circle of it on our old faded red pickup and when I wiped it off, the results were amazing. There was this softball sized, extremly shiney spot on the hood that now kind of looks strange with the rest of the piant looking dead. The longer it stays on the car, the easier it is to wipe off.
I tried it today, hmmmmm not sure if I like it or not, but then again I have not had a lot of dealings with "cleaning" a car. I just wish there was a way to click my heels 3 times and it be done! But from what I can tell, IMO, it works better on Base/Clear Coat than Acrylic Enamel
Adirondack Nats car show is coming to Lake George soon. I might have to get some of that stuff-looks great!