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Hi all, Ive been building a small necron army for a little while, and I found an extremely simple and good looking way to paint rusty necrons.

Step1. Build your friggin' necrons
Step2. Undercoat with black primer
Step3. Paint armored carapace with silver (I used mythril silver, but boltgun metal or any other color works)
Step4. take a paintbrush-load of scorched or bestial brown and mix it about 75/25 with water.
Step5. once "ink" solution is mixed, paint it onto any areas you want to be rusty on your models.
Step 6. Repeat as necessary.

This method works extremely well, and the rust looks very realistic. However, because the water and paint dry at different speeds even when mixed together, you will often be left with only slight rust colouring, if that is the case, repeat the process with a hgiher concentration of the brown paint, more like 50/50 mix with the water.

I've found another good way is to use a scorched brown basecoat over the model once sprayed black, then carefully apply boltgun metal over some areas leaving some schorched brown. Then apply a careful drybrush of chainmail over the metal and then once this is dry mix brown ink and black ink, once thinned apply all over the model. Once dry apply a thin line of chaos black to the edges of the scorched brown.

Of course this is a more 'a**l' and time consuming process it looks spectacular