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The technique is called stippling and the best way to do it is with a bargain bin chip brush or a super old hard bristle toothbrush. For corrosion having a texture paint isn't a bad idea either, not that MJOLNIR would rust in the same manner as iron and steel that we're used to. If you want to go for a red/brown rust, mix some of that burnt sienna with some PVA glue and some dry, clean grit. I have a bunch of scatter flock and ballast from building miniatures but using sand or sawdust is a good option. Mix in a few oranges and browns afterwards by drybrushing and it'll look pretty rad.
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Remember though to put rust spots in realistic places! Rust likes to form in uncoated areas and places where there is structural stresses on the metal. So you'll see rust around high edges where scuff damage would remove surface coatings and in recesses where welds between plates meet at sharp angles.
Awesome explanation! People have mentioned adding dirt and stuff, but it doesn't feel right painting on stuff from the ground onto something that is my pride and joy. I will definitely be mixing the burnt sienna with PVA glue and some sawdust from workshops around campus because it's easily obtainable.
Also, I don't have a super old bristly brush, and there's no art department on my campus... I've tried to purposely destroy one I've sacrificed by smashing it into the wall, but it's still soft and unbroken. Is there some sort of thing I can do to the brush to make it paint as if it was old? Something like not washing it after using it and allowing the acrylic paint to dry on it?
As a side note, I was been thinking about getting the makeup brush from the local store, but now it seems like that wouldn't be a good idea since the brush will still be soft and spread the paint.
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