I think you guys are confusing yourselves.RS paints their green HDPE/Poly helmets white if you can still get one. They don't paint their ABS/PVC helmets apart from their detailing as the helmets are already white. Hero helmets in ANH are non painted white ABS. Just like RS'S normal stunt helmets. All Armor in ANH was mainly 1.5mm ABS apart from some parts being thinner.
Ben
I'm surprised RS don't paint their stunts white at all, I guess it saves them a whole lot of time.
I think the stunts look better painted, whether they are ABS, PVC or HDPE beneath. It makes them closer to the real thing appearance wise, and it kind of feels right as well.