Cavity Wax
Cavity wax is a corrosion-protection wax sprayed into hollow body sections such as sills and doors.
What is Cavity Wax?
It creeps into seams and repels moisture. Manufacturers apply it at the factory. It can be renewed with special nozzles. Common places for cavity wax are sills, door bottoms, tailgate edges and chassis rails. Applying it in warm weather helps it flow into seams. It is different from underbody coating, which protects visible surfaces against stone impacts.
How it works
The wax forms a protective film that blocks moisture and oxygen.
Why it matters for your car
After body repairs, cavity wax should be reapplied. Drain holes must stay clear.
Other terms
- Battery Registration (Battery Coding)
- Blind Spot Monitoring
- Centre Bore
- Creep Mode (EV Creep Setting)
- Cylinder Deactivation (Cylinder On Demand)
- Door Card (Door Panel)
- Electronic Stability Control (ESC)
- Emergency Brake Signal (Flashing Brake Lights)
- Engine Oil
- Hazard Warning Lights
- Insurance Claim (Accident Claim)
- OBD-II
- Power Band
- Power-to-weight Ratio
- PTC Heater (Electric Auxiliary Heater)
- Roof Box (Roof Top Carrier)
- Snow Foam
- Timing Chain
- Torsion Beam Rear Axle (Twist Beam)
- Vehicle History Report