Spit shining is an old technique used by shoe-polishers to get amazing results. This technique can also be used with applying wax on cars. The technique needs some practice to master properly, but can give amazing results.
Normally, if you want to apply multiple layers of a protective product it is necessary to wait 12-24hrs between each coat. However, it is possible to apply two layers of a carnauba paste wax in one go by using the technique of spit shining. This is the generic technique I use for spit-shining:
Spit shine is used to enhance the reflectivity and durability from a carnauba wax and has been known to produce awesome results.