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Does one exist? Something that could look like rust is coming out the joints on power armour or a leaking pipe, for example

You get weathering fluids for that kind of effect. The Vallejo mecha range has a specific gloss oil wash as well.

I like how easy MIG Light rust effect is to use.

Racerguy180 wrote:
I like how easy MIG Light rust effect is to use.

For oil?

Ak interactive do an engine oil enamel fluid. Alternatively, you could mix your own using black and umber oil paints.

https://www.scalemodelshop.co.uk/35ml-fresh-engine-oil-ak-interactive-ak-084-p4657/s4657?utm_source=google&utm_medium=cpc&utm_term=ak-interactive-35ml-fresh-engine-oil-ak084&utm_campaign=product%2Blisting%2Bads&cid=GBP&glCurrency=GBP&glCountry=GB&gclid=EAIaIQobChMIs43YtqqF-AIVAZ7tCh2w8gkaEAQYASABEgJS7PD_BwE