Trucks are the most expensive vehicles to repair if rust takes hold. Frame damage on a modern truck can be a write-off. At Ultimate Detail & Rust Check, we protect trucks with the full Rust Check two-step process: oil-based drip formula into every cavity and thick Coat & Protect oil undercoat on the exposed frame, crossmembers, and suspension. 100% oil-based. We never use rubberized products that crack and trap moisture.