How you apply the Hydro is really a function of temperature and drying time. You do not want the Hydro to dry on the paint before you get a chance to spread it out. If it does you will need to re-apply some more Hydro to the dried area. So sometimes I spray the whole MINI before I wipe it down and other times I do just a panel at a time - depending on how warm it is.

 

^ +1. i too spray and wipe a section at a time.

 

Section at a time...