Is this going to be the prime colour? or do you actually want them to look rusty?
If you want them to look rusty I would recommend using pigments or powders as they are known. Generally I just buy a cheap pack of soft pastels from amazon (£3), crush them up and apply to a silver base.
If you want to go with generally a rust colour, I would recommend Vallejo range, they have some nice rust colours.
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