Trading Paints uses your browser’s Local Network Access to communicate with the instance of Trading Paints Downloader, if installed and running on your computer.
If you make changes to custom paints on the Trading Paints website while Downloader is running and you have Keep paints synced from website enabled, Downloader will attempt to update your paints immediately when they’re changed.
Additionally, this is a requirement for the Sim Preview feature in Paint Builder so that Paint Builder can send commands to Downloader in order to update your paint preview for iRacing.
To do this, your browser (Google Chrome and others) may request access to look for and connect to any device on your local network. The Trading Paints website only looks for the instance of Trading Paints Downloader running on your local machine.
If you choose Block initially when prompted, you may need to reset your browser settings.
To reset your settings, in your browser’s address bar, click the Settings icon while on tradingpaints.com, and then choose Site settings.
Then, under Local Network Access (this may be at the bottom of the list), choose Allow.
