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did some experiments with heavy rust on some leftover barrels, not sure how it went. Maybe the aught to be somewhat darker and less uniform.
Also base-coated the cannons, the black one is going to get a sand-green camouflage.
The rust-brown one is a bit tricky since I didn't exactly think things through when I painted it, just thought "it's going to be rusty". Maybe it's possible to use a sponge to get some irregular contrasting color as if from the original color (the hairspray method might work here too).