>>6029566That's the stuff I have linked below behind the visor, I think it's called aurora film or something similar. And you can paint either the back of the visor silver (my Build Shaldoll) or the plate behind it (Jesta Cannon).
http://www.ebay.com/itm/2pcs-For-Gundam-Modify-MG-PG-HG-Gundam-Multi-Purpose-Sticker-/291396016378