There are some YouTube videos of the factory applied spray-on liner. It appears to be done after most assembly is complete. If you did not buy new with it already in, Mopar sells their mixture to companies who have molar approved spray equipment. I got mine from the factory with the spray-in liner. After delivery, I added a great rubber mat pad for the bed floor that provides a great custom fit. It keep things from slipping and sliding and provides another level of protection. One of my best and most useful add-ons.Does anyone know when/what order the bed liner is sprayed/applied at factory? Last after complete assembly or in a paint stage?