BB's or nuts + gallon can + paint shaker.
Here's that piece before it's date with the dremel. It was a left over piece from a Graflex-ish control box that Tim used to sell.
weathered piece.jpg
Google pitting texture. Take a negative, print it on transfer paper and just do normal etching technique either with acid or current method. Once complete you can leave it as is, or submerge the entire thing in etching solution to give you a overall patina look. Take some steel wool to it and walla. If you are in an apartment I would not use the acid method.
I'm actually planning on building an oversized rock tumbler for physical weathering at some point down the road. I figure 4 servos, some RC car tires. a 5 gallon bucket for a barrel, an arduino for a controller, and a pound of machine screws for a medium.
wet sea salt crystals placed on bare alloy leave for a few days in a damp room or damp down now and again with a water spray bottle
should leave small pits in the alloy . if you do this before spray painting remove the salt crystals after you can get some quite serious looking pitting
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