Audi A8 D5 - Corrosion Protection; Corrosion Protection for Attachments and Welded Parts; Cavity Sealing

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11 Corrosion protection
Corrosion protection as provided when vehicle leaves the factory
must be restored after repairs, using materials which have been
approved by the vehicle manufacturer.
The standard factory corrosion protection is described in the gen‐
eral and vehicle-specific ⇒ Paintwork manual .
11.1 Corrosion protection for attachments
and welded parts
♦ Bare metal areas must be primed immediately after repairs.
♦ Holes must always be deburred.
♦ Always apply welding primer/structural adhesive to both sides
of welding flanges (in accordance with Workshop Manual).
♦ Prime inside and outside of seam areas prior to sealing.
♦ Sealing compound must only be applied to primed panel sec‐
tions.
♦ Make sure you seal overlaps and edges of metal panels, butt
joints, welding seams etc. completely using sealing com‐
pound.
♦ Restore paintwork structure as described in Paintwork man‐
ual.
♦ Restore underseal using long-life underseal material.
♦ All cavities in the repaired area must be sealed after applying
topcoat.
♦ Separating cuts (e.g. in side panel) must be fully sealed.
♦ Clear the water drains after cavity protection material has
dried.
11.1.1 Contact corrosion
Contact corrosion can occur if unsuitable fasteners (bolts, nuts,
washers etc.) are used.
For this reason, only fasteners with a special surface coating are
fitted.
In addition, all rubber and plastic parts and all adhesives are made
of non-conductive materials.
Always install new parts if you are not sure whether parts are
suitable for re-installation.
11.2 Cavity sealing
The standard factory corrosion protection is described in the gen‐
eral and vehicle-specific ⇒ Paintwork manual .
WARNING
♦ Before beginning work of this nature, you must read the
safety data sheet for precautionary measures and safety
advice.
♦ The usual precautionary measures for chemical products
must be heeded for all products, even those which are not
subject to labelling requirements.
General InformationBody Repairs, General Body Repairs - Edition 04.2018
56 11. Corrosion protection