SEALING (page 5 of 8)

CORROSION PREVENTION AND SEALING

SEALING

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Seam sealer on doors

Seams symmetrically opposite to those shown are also treated.

Underbody sealer
Underfloor areas and sill outer panels are treated with a Plastisol PVC underbody sealer. This material is not suitable 
for re-treatment. When repairing areas of underbody sealer, strip the factory-applied underbody sealer back to a 
suitable break point. Ensure that a clean metal surface is exposed and that the edge of the existing sealer adheres 
soundly to the panel.

Apply new underbody sealer between primer and surfacer paint operations. Apply seam sealer as necessary before 
application of underbody sealer. Ensure that blanking plugs and grommets in the floor pan (except those used for wax 
injection) are fitted before underbody sealer application. Refit any heat-fusible plugs which have been disturbed in 
repair with the aid of a hot air blower, or replace with rubber grommets.

CAUTION: Ensure that suspension units, wheels, tyres, power unit, driveshafts, exhaust and brakes (including all 
mounting points) are shielded prior to application of fresh underbody sealer.

Precautions during body repairs and handling
Take care when handling the vehicle in the workshop. Underbody sealers, seam sealers, underbody wax and body 
panels may be damaged if the vehicle is carelessly lifted.

Proprietary anti-corrosion treatments
The application of proprietary anti-corrosion treatments in addition to the factory-applied treatment could invalidate 
the Corrosion Warranty and should be discouraged. This does not apply to approved, compatible, preservative waxes 
which may be applied on top of existing coatings.

Fitting approved accessories
When fitting accessories ensure that the vehicle's corrosion protection is not affected, either by breaking the protective 
coating or by introducing a moisture trap.

Do not screw self-tapping screws directly into body panels. Fit suitable plastic inserts to the panel beforehand. Always 
ensure that the edges of holes drilled into panels, chassis members and other body parts are protected with a suitable 
zinc rich or acid etch primer, and follow with a protective wax coating brushed onto the surrounding area.

Do not attach painted metal surfaces of any accessory directly to the vehicle's bodywork unless suitably protected. 
Where metal faces are bolted together always interpose a suitable interface material such as weldable zinc rich 
primer, extruded strip, or zinc tape.

M77 2175B