About Trading Paints
The piece that matters on track is the Downloader, a small Windows app that runs in the background while you race. It watches your iRacing session and pulls the custom paint schemes of the drivers around you, so their cars render with community liveries instead of the stock look. If the Downloader is not running you only see default paints, so it is a set-and-forget background process rather than something you interact with mid-session.
The creation side scales with membership. Free members upload liveries they have made in an external editor to My Paints and assign them to specific cars, then share them in the Showroom. A Pro membership unlocks Paint Builder, a browser-based design tool for building liveries without separate software, along with decal layers, custom number styles, per-car helmets and suits, night-race paints and a saved paint history. So the service runs from simply seeing everyone else's paints up to a full in-browser design workflow.
It is aimed at iRacing drivers who want custom liveries to appear in their sessions, whether that means running other people's paints or publishing their own. Trading Paints is one of SimLauncher's built-in companion apps: because the Downloader has to be running for liveries to show up, a profile can toggle it on and start it automatically alongside iRacing, so custom paints are loading from the moment you are on track.