When weathering, what is happening is that an outer layer of paint is being removed due to bullets or impacts or just general...weather, and the metal underneath becomes visible. So for things like IG tanks, the weathering would involve the top color, then some black showing through where a tank would have had a layer of primer put on, and then the bare metal underneath.
For Necron vehicles, things get a little different, since they're pretty much composed of shifting metal with no paint, no primer, nothing but the outer layer that might have dust, dirt and debris on it, then the shiny T-1000 living metal underneath.
I would say do the whole vehicle as normal, wash it, make it look used and weathered from being in a combat environment with nuln oil and and agrax earthshade to simulate mud and dirt, and then the areas where you want deeper weathering, put streaks of leadbelcher. In the middle of those streaks, put a brighter metal like platinum or silver (or whatever the GW equivalent of it might be) to show where the shifting, living metal underneath has been revealed through the grime.
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