clonesix, It's not lit 'cos I don't have the LEDs yet. I have ordered and paid for them so I should have them next week sometime.
Arcko, I haven't bothered to seal the paint with anything, just polished it with T-Cut before weathering.
Fawbish, this helmet was Rapid Prototyped from Marvel STL files, cleaned up, moulded, cast in a Polyurethane/aluminium mix.
Zabana, no clearcoat. The weathering is very simple. I used grate polish/iron paste. Apply generously, rub in with a brush. Remove with lighter fuel on a rag...leaving in and around any split lines...and using an upward motion on the faceplate (creating the 'abrasions'). The grate polish dries quickly...you can buff this too, creating a deeper, shinier colour.