In Far Cry 6, you'll be able to get your hands on a spray can and use it to graffiti the walls of enemy outposts. Here's where you can find spray cans in the game:
The first place you can look for spray cans is at any enemy outpost that you liberate. After taking over an outpost, search around for any red barrels - these will usually contain a few spray cans.
Another place to find spray cans is inside crates scattered throughout the world. These crates are often located in difficult-to-reach places, so keep your eyes peeled when exploring the environment.
Finally, you can also purchase spray cans from vendors located in various settlements across Far Cry 6's map. If you need some quick cash, be sure to take on side missions and bounties - this will help you earn money to spend at vendors.