HOW TO: DIY rock chip-guard using sprayable bedliner - YouTube
How should I go about applying the rock guard stuff, also the places that have a bit of metal exposed and have started to surface rust, should I sand to bear metal
Scorpion Rock Guard
Rust-Oleum Rock Guard , 12-Ounce Crystal Clear Color | eBay
Rubberized Rockerguard Undercoating, Black, 550-g | Canadian Tire