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Economy system

Underbody Protection and Restoration System

Protects the underbody, sills and wheel arches against stone chips and corrosion, from stripping the old paint to applying anti-gravel stone chip coating.

Application steps

5 steps

Suitable substrates

  • Steel panel

Ideal for

  • Underbody and floor pan protection
  • Sills, lower doors and wheel arches
  • Classic car body restorations
  • Preventive maintenance ahead of winter
About the system

The underbody, sills, wheel arches and lower door areas are the parts of a vehicle most affected by stone chips, road salt, moisture and mud. In these areas, even minor paint damage can quickly turn into rust and loss of metal. The Underbody Protection and Restoration System starts by removing old, worn coatings with Paint Stripper; the cleaned, sound metal is then protected without delay with 1K Fast Repair Primer.

Applied over the primed surface, Anti-Gravel Stone Chip Protector uses its flexible, textured structure to help absorb the impact of stones and gravel and to make it harder for moisture and salt to reach the metal. If desired, the anti-gravel layer can be painted in the vehicle colour, preserving the original look of sills and lower door areas. The system offers an economical and effective way to protect the lower body, both in the preventive maintenance of vehicles in daily use and in classic car restorations.

For mixing ratios, drying and flash-off times, refer to each product's own Technical Data Sheet.

Step-by-step application

  1. 01

    Stripping the Old Paint

    ZN-620Paint Stripper

    Brush the product on in a thick layer, working in one direction; when the paint blisters and wrinkles, scrape it off with a scraper and repeat if necessary. Keep it away from plastic, rubber and fibreglass parts; work in a well-ventilated area, wearing the protective equipment specified in the Safety Data Sheet (SDS).

  2. 02

    Rust Removal and Cleaning

    ZN-530Surface Cleaning Thinner

    Remove any remaining rust and old protective coatings down to bright metal with a wire brush or sanding disc. Remove paint stripper residues, grease and dust completely with the thinner; any residue will impair the adhesion of subsequent layers.

  3. 03

    Primer

    ZN-2301K Fast Repair Primer

    Prime the bare metal immediately after cleaning, before flash rust can form, using thin coats that give full coverage. On rough or large areas that need filling, 4+1 Acrylic Primer Filler can be used instead.

    Alternative: ZN-210 4+1 Acrylic Primer Filler

  4. 04

    Stone Chip Protection

    ZN-610Anti-Gravel Stone Chip Protector

    After masking off the exhaust, brakes, suspension and moving parts, apply the product in 1–2 coats with an underbody coating gun until the desired texture is achieved. You can adjust how coarse the texture is by varying the air pressure and the gun distance.

  5. 05

    Topcoat (Optional)

    On visible areas such as sills and lower doors, a topcoat in the vehicle colour can be applied once the anti-gravel coating has fully cured. Refer to the product's Technical Data Sheet (TDS) for the waiting time before painting.

Benefits

What this system delivers

  • Protection against stone chips

    The flexible, textured anti-gravel layer helps to reduce the impact of gravel and stones on the paint and the metal.

  • Barrier against corrosion

    Together, the sound metal base, the primer and the anti-gravel layers make it harder for moisture, salt and mud to reach the sheet metal.

  • A clean start

    Completely stripping old and blistered coatings brings hidden rust spots to light and allows a lasting repair to be made.

  • Economical and practical

    Built on just a few products, the system is easy to plan for both workshop maintenance and restoration projects, and does not strain the budget.

Other systems

Planning a different job?

All systems
  • Standard

    Spot Repair System

    Confines stone chip, scratch and small dent repairs to the damaged area; blending aims for an invisible transition without repainting the whole panel.

    1. ZN-530
    2. ZN-130
    3. ZN-230
    4. ZN-320
    5. ZN-520
    View system
  • Premium

    Premium Panel Repair System (HS)

    A panel repair system built on 5+1 HS Acrylic Primer and 2K Acrylic HS Clear Coat, aiming for high film build in fewer coats, deep gloss and a durable finish.

    1. ZN-530
    2. ZN-110
    3. ZN-130
    4. ZN-220
    5. ZN-330
    View system
  • Standard

    Standard Panel Repair System (MS)

    The standard system for everyday panel repairs: easy to apply with 4+1 Acrylic Primer Filler and 2K Acrylic MS Clear Coat, balancing cost and quality.

    1. ZN-530
    2. ZN-110
    3. ZN-210
    4. ZN-320
    View system

Let's build the right system for your workshop together

Talk to our team about product selection, application and pricing. We will quickly prepare the right system and quote for your needs.

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