Heres the link to a picture of the underside of my front end after it had been flow coated, probably less than 1L used. The only prep was to give it a blow over from the airline and then brush painted upside down before painting. Any overspray can be rubbed off with meths due to the wax or if very bad just another coat of flow coat. Really transforms the finish and general appearance.
http://www.madabout-kitcars.com/foru...t=5892&page=16