Like any other part of your vehicle, it’s a matter of maintenance. No one-time application will last forever. “Permanent” rust protectants usually offer a warranty ranging from 8-10 years, meaning they can only delay serious rusting. Rust Check, on the other hand, maintains effective corrosion protection over a longer time period by completely re-treating your vehicle on an annual basis.
Rust Check also protects brake and power-steering lines, which are very costly to change or replace in the event of rust damage.