Rust Check Coat & Protect can be thought of as a thicker version of Rust Check, with good adhesion and wash resistance, making it ideal for exposed undercarriage areas, Coat & Protect eliminates dripping from the undercarriage, but does not harden; it is self-healing, won’t crack or peel, and can be applied to both new and used vehicles. Coat & Protect is a premium product that contains a very high percentage of the same type of effective corrosion inhibitors used in Rust Check.