Rust treatment undercoats are sprayed applications of wax, polyurethane, or fine-grade asphalt onto the underside of vehicles. They lock out water, ice and salt to create a rust-preventive coating.

Rubberized undercoatings protect fleet vehicles from moisture, salt, and road debris. These treatments lock out water to prevent corrosion, dampen road noise and loud engine revs, and repel harsh weather and chemicals to prolong vehicle undercarriages.