you stand very wierd haha, but that is beside the point.
I would paint the scratch marks some sort of metalic silver and weather over it, that way it looks like dull metal.
Or tape off the area around the scratches and R n B it shiny, then weather it.
In fact, weather the whole helmet, not just the white, I already told ya that Cameron, what are ya doin????
Haha just kidding, but seriously, weather it.