Not I want to doubt you, but got proof or can someone tell me where
to look?
Matt sticker, where buses don't look very shiny:

Usually there's a black "belt" beside a restickered single decker
bus.
Gloss sticker, buses generally looks very bright and
shiny:

A repainted surface, usually don't look very bright and still
can see some marks of ads or previous livery underneath the new
coat of paint:

Perhaps not for this bus, but there are buses which looks
unpleasant with spots of the underneath layer.