Kerb rash — the scuffing you get from brushing a gutter or a car park kerb — is almost always cosmetic. The scrape removes paint and shaves a little aluminium off the rim’s outer lip, but it rarely threatens the wheel’s structure. That makes it one of the few wheel repairs a careful owner can tackle at home. This guide walks through the DIY process for a painted alloy, explains the one finish you shouldn’t attempt yourself, and shows where to draw the line between cosmetic and structural damage. For the bigger picture of what your wheels are made of, see alloy vs steel wheels: the honest trade-off.

Is your kerb rash cosmetic or structural?

Before you buy any products, inspect the wheel properly — ideally with it off the car and degreased so you can see the full extent of the damage. Treat it as cosmetic only if it is surface scuffing and shallow scratches on the face or lip. Stop and get it assessed by a wheel specialist if you see any of the following:

• A visible crack, however fine, or a “scaly” crazed surface in the metal.
• A deep gouge you can catch a fingernail in, or missing chunks of alloy.
• Any sign the rim is bent or no longer sits true — covered in can bent alloy wheels be safely repaired in Australia?
• Air loss after the kerb strike, which can mean a cracked rim — see cracked alloy wheels: weld or replace?

Structural damage is never a DIY paint job. Cosmetic rash, on the other hand, is fair game.

What you’ll need

Alloy-specific primer, a colour-matched base coat (silver/graphite for most factory wheels, or your wheel’s exact colour), clear lacquer, wet-and-dry sandpaper in 400, 800 and 1200 grit, a little high-build filler or alloy putty for deeper nicks, masking tape, white spirit or wax-and-grease remover, and a lint-free cloth. Aerosol kits sold in Australian auto stores bundle most of this.

How to repair kerb rash step by step

1. Clean and degrease. Wash the wheel, then wipe the damaged area with white spirit or wax-and-grease remover so paint and filler will bond.
2. Sand the damage back. Work the scuff with 400-grit wet-and-dry until you reach smooth, sound metal, feathering slightly past the damaged edge. Refine with 800 then 1200 grit so there’s no hard ridge.
3. Fill deeper nicks. If the kerb left a gouge, apply a thin layer of alloy filler, let it cure, then sand flush. Several thin passes beat one thick one.
4. Clean again and mask. Remove all dust with a lint-free cloth and white spirit, then mask the tyre, valve and any area you’re not painting.
5. Prime. Apply a thin, even coat of alloy primer. Let it dry fully — typically 30 to 60 minutes.
6. Colour coat. Build the base colour in several light coats rather than one heavy one, letting each flash off. This is where a good colour match earns its keep.
7. Lacquer and finish. Apply clear coat to match the original sheen, let it cure, remove the masking, and gently polish the edges with a fine compound if needed.

Expect the active work to take two to four hours. Let the wheel cure for at least 24 hours before refitting the tyre and driving, so the finish hardens fully.

Why can’t you DIY a diamond-cut (machined-face) wheel?

Diamond-cut wheels — also called machined-face — have a bright, lathe-turned metal face sealed under clear lacquer. You cannot recreate that fine concentric machined pattern with sandpaper and a rattle can; it requires a CNC lathe to re-cut the face, followed by fresh lacquer. Worse, if you sand through the lacquer and leave bare aluminium exposed, moisture creeps under the clear coat and the finish corrodes and lifts (“worming”) around the repair. Diamond-cut and other complex finishes are a job for a professional refurbisher. The same caution applies to polished and intricate multi-stage finishes. If you’re deciding between refinishing methods generally, see powder coating vs painting wheels.

DIY or pay a professional?

A mobile kerb-rash specialist will often do a single painted wheel on your driveway. For what professional refinishing costs in Australia and when it’s worth it, see wheel refurbishment costs in Australia.

Frequently asked questions

Does kerb rash fail a roadworthy or affect safety?

Purely cosmetic scuffing doesn’t make a wheel unroadworthy or unsafe. The risk is only if the kerb strike also cracked or bent the rim, which can cause air loss or vibration. If in doubt, have it checked.

Can I just paint over kerb rash without sanding?

No. Paint won’t bond to a rough, oxidised scuff, and the ridge will show through. Sanding the damage smooth and feathering the edges is what makes the repair invisible.

Will a DIY repair be invisible?

On a silver or painted wheel, a careful job gets very close. The hardest part is matching the exact factory colour and sheen; a professional has access to tinted matches and spray booths that produce a more seamless result.

How much does a professional kerb-rash repair cost?

It varies by finish, location and whether it’s mobile or in-shop, and diamond-cut work costs more than painted. Rather than quote a figure that dates quickly, get a couple of local quotes — our refurbishment costs guide explains what drives the price.

Product availability and finish types vary — match any paint or primer to your specific wheel and confirm the finish type with a wheel refinisher before starting, especially if the wheel may be diamond-cut.

Sources: AutoPartsPro — How to fix curbed alloys; AutoSpeed — Repairing alloy and steel wheels.