I think Dave means net curtain! Use it as a mask with an airbrush.
I think the prop is silicone bronze- looks like brass, but much stronger stuff. If you do paint it, consider etch priming first. Interesting that Simon has used a heavier alloy for this prop, he used to cast them from aluminium like the shroud.
On the subject of rotors, I watched a program the other night about Rolls Royce, and how they construct their jet engines. They showed some of the construction of the fanjet blades. Made from Titanium in a composite fashion (top secret technique) each blade costs as much as a family car (yikes!!).
Rolls Royce make the propulsors for RN subs, and they base them on fan jet technology, so I think they may use titanium blades for the props. So a dull silver may be more authentic.
Pure conjecture of course- these things are hush hush.