Z-3 ~ Undercoat



Castle® Z-3™ is a heavy duty, non-paintable undercoat and sound deadener. This is a low cost way to re-coat fender walls and undercarriage. Tough film will not pinhole, sag, or drip in normal application. Z-3™ exceeds US Government specifications for undercoating (TT-C-502A). Z-3™ provides superior protection against salt corrosion. Avoid application of undercoating closer than 12 to 14 inches from entire exhaust system.


  • Rust Prevention
  • Auto Undercoat
  • Trailer Undercoat
  • Tree Wound Dressing
  • Wood Fence Post Preserver
  • Eaves, Troughs & Flashing Sealer


1. Shake product well before and during use.
2. Spray, holding can 8 to 10 inches from surface, using smooth and easy movement.
3. Coating will dry in about 2 hours.
4. Clean valve by inverting can and spraying until only pressure escapes.


  • 24 oz (#C2401) 12/case


Store below 120°F.


  • Color – black
  • Specific Gravity – 0.9
  • Flash Point – -40°F
  • Cleaning – N/A
  • Odor – solvent
  • Density – 4.0
  • Freeze Stable – yes

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U.S. Customers
Castle AutoChem Products Ltd services Canadian customers only.

U.S. customers, please visit the Castle U.S. Website,
or call 1-800-876-0222.