just a hypothesis la.. but heard from PPS guy (not right for me to say who here) some bros actually did 12 layers.. I asked sure boh..?
I learnt this the hard way . . .
its not the quality of coats but rather the detailers' applications, i.e. the prep works on the car surfaces that really counts!
they can do 100 layers, but if they dun clean thoroughly or polish-off surfaces evenly prior the next layers
the outcome is even worse than w/o any layers, i.e. become dull and patches everywhere thru' weather wears especially for white & black colors!
other colors or with tones may not be visible, but just a hand feel will be able to tell.....
i.e. why ultra-ray lights, car clean clay and polishers are the necessary for a good detailers
it will be easy to judge the "kung ho" of a detailer w/o the above - just manual hand wash and apply . . . .
but then again, is the detailer really using the above or just to show only .....