These are excellent guides for applying Zaino:
http://www.zainobros.com/files/faq.htm
http://www.zainobros.com/files/tips.htm

Now, if anyone questions the value of Zaino..I challenge them to a time trial. Compare the time it takes to treat a fender with Zaino to the time it takes to polish a fender (properly) with Mequiars. If the shine doesn't win you over the ease of use will.

What used to be a sweaty all day job is reduced to a laid back job that's completed in a couple of hours.