MD Car Care Chassis ProtectantMD Car Care Chassis Protectant Rust & Corrosion Barrier Protect Your Undercarriage from Sand, Salt & Water MD Car Care Chassis Protectant is a powerful, non lanolin, non fish oil formula designed to shield your 4x4s underbody from the harshest elements especially when beach driving or tackling muddy trails. It forms a long lasting barrier that repels sand, salt, and water, helping to prevent rust and corrosion on all exposed metal surfaces. Key