Truthfully, I guess it depends on how accurate you want to be. The two-layered version of visors is great if your helmet will accept a flat visor like that. This helmet does not since it should be a compound curve. We want these to be as close as possible, especially in the visor area since that is where everyone looks when they see you.
I think it was a few hundred to coat the samples. I imagine the final visors will be the same.