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Reverse Graffiti Project
(lemmy.dbzer0.com)
"Instead of using actual spray cans, some artists are just cleaning dirt off of certain areas to make their masterpieces and they are calling it reverse graffiti"
And as time goes on and more dirt appears, you can do a cool layered look.
Waiting for your layer to cure like a real artist, just a week more or so and it should be okayish!