A model/ model railroad trick . I took a shiny chain ring and made it a rusty one for my ratrod bike project.
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1) clean shiny chainring
2) oxide red primer
3) a mist of black
4) smells like apple pie - cover with cinnamon
5) After a couple of coats of matte clear
6) apply sea salt
7) spray with Grey primer
8) let dry and brush off the salt & lightly spray with the matte clear.
WEllen see what happens.....