[Nordicus]

Hum the image is a 403 forbidden unfortunately - Otherwise I will gladly weigh in

 

[Nordicus]

Odd. Changed from link to actual image.

There we go!

From what I can find around the various databases, the armor is silver-white which I would say is a metallic colour. If you want to achieve a very white metal, there is a quick and easy way to do it, that only requires two paints:

- Vallejo Air: Steel
- Nuln Oil

Steel is a air paint, but has enough pigments to be able to be painted on with a brush and will cover almost any undercolour in one coat. It is also thinned down, so you can put it on fairly heavily and still get a nice even coat when it dries. (After I discovered this about the Vallejo Air line metals in general, I have hardly used anything else. They're that good!)
It is a very bright metal color and should do very nicely for the model above. It also has more metallic flakes than any non-gold GW colour, so you will get a very solid metallic colour.

It is also very good for drybrushing, ironically enough, because of the high pigment it has. I use it for edge highlighting on my models and the final metal sheen.

Alternatively, if you want more shadow in the model you can use Ironbreaker as a undercoat, Nuln Oil it and use the Steel as drybrushing.

 

[Nordicus]

Would you suggest a white or black undercoat then a layer of the Steel Air? Or a Leadbelcher basecoat then a Steel Air layer?

Personally I use a black undercoat for metallics in general. The shade will be a bit darker, but it's more forgiving if you should miss a spot. White will just make it a right pain if you cannot reach a spot, where black will simply be a shade. You can see my newest post in my PLOG for a example of how the Air paints look - I have used the darkest one they have, which is Gunmetal: The Vallejo equivalent of Leadbelcher.

I would get both Gunmetal and Steel in the Vallejo line. Then you can experiment if you wish to use Steel exclusively or apply Gunmetal as a basecoat first.

And I assume the Nuln Oil is for the standard wash-darkening of the edges and trims, etc.

Aye exactly - Depending on what you go for you can either use Nuln Oil, Aggrax Earthsahde or a watered down Vallejo Smoke. Seeing as you're going for a clean silver, Nuln Oil is your best bet. One could argue blue shades, but personally I think they often look too blue and then it more looks like a cheap pendant bought at a gift shop than actual metal.

Would you say that all the Vallejo Air Metallics, ie Arctic Blue or Signal Red, could be used like that?

Absolutely - All Vallejos Air metal paints are far superior in my humble opinion. GW wins by having some shades not available anywhere else (Brass Scorpion being a prime example), but if you can find the same shade with Vallejo Air, it's usually better in my experience, not to mention easier to work with as you don't need to water them down with any form of thinner.