Rust Check inside body panels and other hidden areas. Your vehicle’s construction requires numerous joints, bends, seams and thousands of associated spot welds. Consequently, areas inside the body sections contain a multitude of crevices, into which corrosive moisture and road salts concentrate. The resulting corrosion not only affects the appearance of your vehicle, but also attacks the joints and spot welds that hold your vehicle together. The result is a vehicle that can become unsafe. Rust Check is a light oil-based liquid, formulated to penetrate into and protect the many vulnerable crevices hidden inside your vehicle.