Why are vans particularly exposed?
Vans typically cover high mileage, are treated harder than passenger cars, and are serviced less frequently. The undercarriage is constantly exposed to road salt, gravel and mechanical wear. And since a van's utility value is its primary purpose, aesthetic upkeep — including rust prevention — tends to be neglected.
Types of rust protection
- Cavity treatment: Wax or oil-based product injected into the car's cavities (door frames, sill rails, threshold tubes). The most important area to treat for most vans.
- Underbody treatment: Rubber-elastic or asphalt-based coating on the undercarriage. Protects against stone chips and moisture absorption.
- Combination: Cavity treatment + underbody is the complete solution.
Products and price range
There is a significant difference in the quality of rust protection products. Cheap solutions are typically short-lived and require more frequent servicing. Premium products such as Dinitrol or Mike Sanders cost more but last significantly longer and come with better warranties.
- Budget treatment: £150–£250, 2–3 year lifespan
- Premium cavity treatment + underbody: £400–£700, 5–10 year warranty
Warranty and documentation
A rust warranty is only worth the paper it is written on with proper documentation. Always insist on a certificate stating the product name, treated area, date and service interval. Observe the service intervals — missed inspections are the most common reason rust warranties lapse.