We do have videos showing the panel interior. Here’s some more info on the process. The rod is actually directional, so we spray the inner and outer sides “left and right” when going through the taillight area. We also use other attachments to reach this area from underneath when the truck is in the air, ensuring full coverage. Even if the taillight isn’t removed, we can still access the taillight housing and box sides from underneath. #krownrustcontrol | Krown Rust Control - Gaylord