Correct Sunny!
An aeroplane is a collection of parts made by the cheapest possible tenderer. End of story!
Paint is a costly business for the aircraft manufacturer and paint is applied as quickly as possible as as thin as possible. It does not matter if it's a new Cessna C182 or a new Bombardier Challenger 605. I have seen crap paint on new Challengers at the factory.
Customs paint jobs with a surface prep etc take considerable time, look better, last longer, but OMG you pay for it when you re-weigh the aircraft. Heavy to paint properly.
Years ago, a Qantas Boeing 707/747 was natural surface metal, polished below the window level, paint above. The time and labor to polish was not a big deal in those day's; people paid money to travel aboard an aircraft, no real discounting. Also paint on a B747 I have no idea of weight but I would assume a 1000lbs plus, and that's a lot of payload.
Today we have chemical wash and blow dry.
The magic of two pack paints which look new many years after application; providing the surface was prepped properly.