Rustproof a car underbody and lower panels

Underbody rust protection

Guide to rustproofing a car underbody and lower panels

A car underbody and lower panels need clean metal, loose rust removal, rust treatment where corrosion remains and a protective coating matched to exposed lower areas. The coating work should protect the metal without covering moving, hot or service parts.

What do you need to rustproof a car underbody and lower panels?

Cleaning and degreasing

Mipa silicone remover and Mipa silicone remover spray remove wax, grease and silicone before sanding, filling, primer or coating work starts.

Rust preparation and sealing

MP Fine sanding pad removes loose corrosion, Miparox anti-rust spray treats firmly adhering rust, and Mipa Rust Sealant penetrates and seals rusted metal before further coating.

Bitumen underbody coating

Mipa Underbody Protection Spray and Mipa underbody protection 1l create a black bitumen based coating for lower panels and underbody areas.

Wax underbody protection

Mipa Underbody Protection Wax 1l Sprayable forms a wax based protective film for vehicle floors, wheel arches and salt exposed lower areas.

How to rustproof a car underbody and lower panels

  1. 1
    Clean the underside

    Wash, dry and degrease the work area so loose dirt and oily residue do not sit under the protection layer.

  2. 2
    Remove loose rust

    Use the sanding pad to remove flaky corrosion and leave only firmly adhering rust for rust treatment.

  3. 3
    Treat remaining rust

    Use Miparox anti-rust spray or Mipa Rust Sealant on corroded metal before covering the area.

  4. 4
    Apply underbody protection

    Use bitumen underbody coating on exposed lower areas and wax protection where a wax film is the better barrier.

  5. 5
    Keep service parts clear

    Avoid coating brakes, exhaust parts, sensors, rubber mountings and drain points.

Which underbody protection should you choose?

Bitumen coating

Bitumen underbody protection suits black lower panel and underside areas that need a tough coating against road splash and abrasion.

Wax protection

Underbody wax suits areas where a flexible wax film and corrosion protection are the priority, especially for seasonal salt exposure.

Technical details

  • Mipa Underbody Protection Wax is intended for vehicle floors and wheel arches and gives corrosion protection against road salt exposure.
  • Miparox anti-rust spray treats firmly adhering rust on steel and creates a dark protective primer layer after drying.
  • Mipa Rust Sealant penetrates rust layers and seals the substrate after loose corrosion has been removed.
  • Silicone remover is useful after mechanical cleaning so oil and wax residue do not remain under the coating.
  • Underbody coating should not be applied over loose rust, mud or damp seams.
Practical suggestion

Mask brakes, exhaust, threads, sensors and drainage holes before spraying so corrosion protection does not create future service problems.

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