Automotive Body Repair

Autobody soldering is the process of using a metal alloy (Sn-Zn-Cu) to fill, shape, and seal imperfections in a car's bodywork. Unlike plastic fillers (like Bondo), solder bonds directly to metal, offering superior strength, longevity, and resistance to cracking.

Properties of KappAutoBody Filler:

  • High corrosion resistance: Zinc and copper enhance protection against rust, which is beneficial for automotive environments.
  • Moderate melting point: Typically around 200–250°C (392–482°F), suitable for bodywork but requires careful heat control.
  • Good mechanical strength: The copper content improves joint strength and durability.
  • Lead-free: Environmentally friendly and compliant with modern regulations.

2 Items

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  1. KappAutoBody 1 lb Kit

    $44.50

    Lead-free Cadmium-free Auto Body buildup and repair solder. 390-570°F / 200-300°C slushy range allows buildup and application in all orientations. - 1lb solder rods, Stainless Steel brush, and instructions.
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  2. KappAutoBody 5 lb Kit

    $179.50

    Lead-free Cadmium-free Auto Body buildup and repair solder. 390-570°F / 200-300°C slushy range allows buildup and application in all orientations. - 5 lbs solder rods, Stainless Steel brush, and instructions.
    View Product
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Why Use Solder Instead of Filler?

  • Durability: Solder doesn't shrink or crack over time.
  • Workability: It can be filed and shaped precisely.
  • Corrosion Resistance: Properly applied solder resists rust better than fillers.
  • Authenticity: Preferred in classic car restorations for period-correct repairs.

Standard uses:

  • Seam sealing after welding panels.
  • Rust repair where a corrosion-resistant bond is needed.
  • Electrical grounding points on the body.
  • Galvanized steel repairs, where zinc content helps match surface chemistry.

Contact Us

Reach out to Kapp Alloy today for product recommendations, data sheets, and expert consultation tailored to your project.