Volkswagen ID.4: Underseal
Volkswagen ID.4 (E21) 2021-2025 Service Manual / Vehicle-specific paint information / Underseal
Underseal, body - overview
Important
- When performing repair work, the underseal should be restored
to match the original appearance and layer thickness.
- Water drainage holes must remain clear.
- All threaded studs and welded nuts with metric threads as
well as all other studs and contact surfaces must be functional
following the application of the underseal.

- Underseal thickness = 0.3 mm
- Underseal thickness = 0.5 mm
- Underseal thickness = 0.8 mm
Underseal, front body
Important
- When performing repair work, the underseal should be restored
to match the original appearance and layer thickness.
- Water drainage holes must remain clear.
- All threaded studs and welded nuts with metric threads as
well as all other studs and contact surfaces must be functional
following the application of the underseal.

- Underseal thickness = 0.3 mm
- Underseal thickness = 0.5 mm
- Underseal thickness = 0.8 mm
Underseal, centre body
Important
- When performing repair work, the underseal should be restored
to match the original appearance and layer thickness.
- Water drainage holes must remain clear.
- All threaded studs and welded nuts with metric threads as
well as all other studs and contact surfaces must be functional
following the application of the underseal.
Side member, front

- Underseal thickness = 0.3 mm
- Underseal thickness = 0.5 mm,1)
- Inner side member
- Aluminium side member reinforcement insert
- Side panel, exterior
- Reinforcement of web plate for side member
- Underseal
Side member, rear

- Underseal thickness = 0.3 mm
- Underseal thickness = 0.5 mm
- Corner reinforcing
- Aluminium side member reinforcement insert
- Side panel, exterior
- Dimension = 45 mm2)
- Rear web plate
1) Surface coating can also be produced via flat stream application.
2) Surface coating can also be produced via flat stream application.
Underseal, rear body
Important
- When performing repair work, the underseal should be restored
to match the original appearance and layer thickness.
- Water drainage holes must remain clear.
- All threaded studs and welded nuts with metric threads as
well as all other studs and contact surfaces must be functional
following the application of the underseal.
Wheel housing

The overview is shown for the left side of vehicle as an example.
- Underseal thickness = 0.3 mm
Underbody, rear

- Underseal thickness = 0.3 mm
- Underseal thickness = 0.5 mm