An oxidised alloy wheel cannot be fixed with a quick wipe-down: understanding the cause helps you avoid unnecessary expense.
You've noticed white or grey blistering beneath the lacquer, sometimes spreading in rings towards the centre of the wheel? This is aluminium oxidation, and once the protective layer is compromised, it progresses from the inside outwards. Before ordering a paint product or taking your vehicle to a body shop, it is worth understanding exactly what is happening, what a restoration costs, and at what stage a change of approach makes more sense.
Why an alloy wheel oxidises beneath the lacquer
Aluminium does not rust in the traditional sense, but it does oxidise: when exposed to moisture and oxygen, it forms aluminium oxide (alumina), a whitish, porous layer. On a standard alloy wheel, a primer, powder coat or paint followed by a clear lacquer seals the metal and prevents this process. As soon as a micro-crack appears — a kerb impact, a stone chip, a scratch from a car wash brush — moisture seeps between the metal and the lacquer. Oxidation then begins in a confined environment, away from open air, and gradually lifts the lacquer: this is known as sub-lacquer delamination.
Aggravating factors observed in France:
- Road salt (winter roads, coastal areas): accelerates galvanic corrosion between the metallic particles within the alloy
- Brake dust (cast iron particles): settles on the inner face of the wheel and retains moisture
- Frequent visits to high-pressure car washes: the direct jets lift the edges of varnish that is already weakened
- Polished or diamond-cut wheels: a more sensitive finish, as the lacquer is applied directly onto the machined alloy with no intermediate layer
Assessing the stage of corrosion before requesting any quote
The extent of the damage determines the right solution. Three practical stages:
| Stage | Visible signs | Viable option |
|---|---|---|
| Superficial | A few white spots, lacquer intact | Fine sanding and touch-up lacquer |
| Intermediate | Visible blistering, lacquer lifting over 1 to 5 cm² | Full workshop restoration (paint + lacquer) |
| Advanced | Through-corrosion, pitted metal, damaged wheel rim edge | Wheel replacement recommended |
A body shop or alloy wheel refurbisher will generally offer a free visual assessment. Pay close attention to the wheel rim edge (the flange in contact with the tyre): this is the area most exposed to impacts, and therefore the first place where the lacquer is likely to crack.
Typical prices for restoring an oxidised alloy wheel
Prices vary depending on the original finish and the extent of deterioration:
- Spot lacquer touch-up (body shop): £30 to £80 per wheel, results not guaranteed on an already oxidised surface
- Full paint and lacquer refurbishment (wheel specialist): €80 to €180 per wheel, i.e. €320 to €720 for a full set
- Diamond-cut or two-tone wheel (machined + lacquered): €150 to €250 per wheel at workshops equipped with a CNC lathe
- Replacement with an original (new, manufacturer) alloy wheel: €200 to €600 per unit depending on the model, excluding fitting/balancing
Restoration is cost-effective at the intermediate stage. At the advanced stage, the cost approaches or exceeds that of a good-condition second-hand wheel. See also our article on repairing or protecting a scuffed wheel: a price comparison to put your decision into a broader budgetary context.
AlloyGator: relevant after restoration, not instead of it
The AlloyGator wheel protector is not an anti-corrosion treatment: it does not penetrate the metal and cannot replace a professional restoration on an alloy wheel that is already oxidised beneath the lacquer. However, once the wheel has been restored or replaced, the AlloyGator profile fitted to the wheel rim edge forms a physical barrier against kerb impacts and micro-cracks in the lacquer — the starting point of any new oxidation. The set (4 alloy wheel protectors, available in 15 colours, compatible with wheels from 12 to 24 inches) is priced at £134.90 inc. VAT. Fitting by a certified approved fitter is charged separately, from £99, and takes between 45 minutes and 1 hour.
If you own an Audi, BMW or Alfa Romeo with wheels featuring a sensitive finish, the dedicated pages list compatible sizes and colours.
FAQ
Is it safe to drive with an oxidised alloy wheel under the lacquer?
Yes, in the short term. Superficial or intermediate oxidation does not affect the mechanical structure of the wheel. However, if corrosion reaches the load-bearing flange or creates deep pitting, the integrity of the wheel may be compromised — a visual inspection by a professional is essential before any long-distance journey or sporting use.
Is polishing enough to remove oxidation beneath the lacquer?
No. Polishing treats the surface of the lacquer, not what lies beneath it. To remove oxidation under the lacquer, the finish coat must be stripped back completely, the metal treated (sanding, degreasing, and sometimes priming), then a new paint and protective lacquer applied. Without full stripping, the oxidation will return under the new coat within a matter of months.
Is restoration of an oxidised alloy wheel covered by the manufacturer warranty?
Generally, no. Corrosion resulting from normal wear (impacts, washing, salt) is excluded from standard manufacturer warranties. Some manufacturers offer a body anti-corrosion warranty that does not cover alloy wheels. Check the terms of your contract; if you are on a PCP or lease agreement, report any damage as soon as it appears to avoid being charged at the end of the contract.
