@quiet_grave used it to make these awesome tin can jack-o'-lanterns:
Looks like you can pick this up at most hardware department stores.
Check out the Modern Masters website for a full product list of rust and patina effects.
A collection of Halloween and Halloween-adjacent media, found across the internet and curated here
HallowJean, creator of some of the most realistic prop corpses I've ever seen, occasionally livestreams while working on her latest creation. I was lucky enough to catch the tail-end of her stream yesterday. Very informative, entertaining, and engaging.
Click below to see HallowJean's Twitch channel, and subscribe to get notified about her future livestreams.