How to Touch Up Stone Chips on Car Paint
Motorway driving sandblasts your car’s front end: tiny stone chips in the paint, each one a future rust spot if ignored. A professional respray of a bonnet costs £300–£600; a touch-up pen costs £10–£20 and an hour of your Saturday. Done well, touched-up chips are nearly invisible even on close inspection; done badly, they’re worse than the original chip. The difference is entirely in the technique — and most people get the technique wrong by using too much paint. Here’s how the professionals do it, scaled down for your driveway.
Why you shouldn’t ignore stone chips
A stone chip isn’t cosmetic — it’s a breach in the paint’s protective system. Modern car paint is layers: primer, colour coat, lacquer. A chip that reaches bare metal exposes steel to air and moisture, and rust starts invisibly underneath the surrounding paint, spreading outward. In Britain’s salted, damp winters, an ignored chip becomes a bubbling rust spot within a year or two — and rust repair (£150–£400 per panel) dwarfs the cost of a touch-up pen. The economics are brutally clear: annual car running costs stay lower when small damage is caught early, before it becomes bodywork.
Check the severity: if the chip shows primer (usually grey), it’s cosmetic — touch up at leisure. If it shows bare metal (shiny silver), it’s urgent — treat within weeks. If there’s already rust (brown/orange), you need to remove the rust first (see below) or the touch-up just seals the corrosion in.
What you need
The right touch-up paint (matched to your car’s paint code — found on the door jamb sticker, under the bonnet, or in the handbook; order by code, not by colour name, because “silver” covers dozens of variants), plus: isopropyl alcohol or panel wipe, a fine applicator (cocktail stick or fine artist’s brush — not the brush in the pen lid, which is too big), 2000–3000 grit wet-and-dry sandpaper, rubbing compound, and lacquer/clear coat if your car has metallic/pearlescent paint. Total outlay: £20–£40. Work in shade, on a dry day, with the panel cool — heat and sun ruin the finish.
The technique: less is more
Step 1: clean. Wash the area, then wipe the chip with isopropyl alcohol. Any wax, dirt or grease under the paint guarantees failure.
Step 2: deal with rust. If there’s any rust, remove it completely — a fibreglass pencil, fine sandpaper, or a rust converter for stubborn spots. Touching up over rust is like painting over mould: it comes back, worse. Get back to clean metal or stable converted surface.
Step 3: apply in thin layers. This is where everyone goes wrong. Don’t blob paint into the chip — dab tiny amounts with a cocktail stick, building up in 2–3 thin coats with drying time between. The goal is to fill the chip level with the surrounding paint, not to mound above it. Thin coats level themselves; thick blobs become visible lumps. Patience here is the entire skill.
Step 4: lacquer (metallics). If your paint is metallic or pearlescent, the colour coat alone looks flat — apply clear lacquer over the top once the colour is dry, again in thin coats. Solid colours often don’t need it.
Step 5: level and polish. After full curing (24–48 hours), if there’s a slight ridge, wet-sand gently with 3000-grit paper (keep it wet, minimal pressure, stay within the chip area), then polish with rubbing compound to restore gloss. This step separates invisible repairs from obvious ones — but it’s also where over-enthusiasm burns through surrounding paint, so go gently.
Common mistakes
Too much paint: the number one error. A blobbed chip catches light and looks worse than the original damage. If you’ve blobbed, let it cure fully, then carefully level it back with wet sanding — recoverable, but avoidable.
Wrong colour match: ordering “silver” instead of by paint code, or not accounting for paint fade on older cars. On cars over 5 years old, even the correct code may look slightly off due to UV fade — blend the repair and keep it small.
Skipping prep: painting over wax, dirt or rust. The repair fails within months and you’ve wasted the effort.
Doing it in direct sun: paint skins over before it levels, trapping solvent underneath. Shade, mild day, patience.
When to go professional
DIY touch-up handles chips up to ~5mm beautifully. Beyond that: SMART repairs (Small to Medium Area Repair Technique) — mobile technicians who repair localised damage for £80–£200, a fraction of bodyshop prices. Full bodyshop for: large damaged areas, dents needing filling, rust that’s spread under the paint, or lease returns where the standards are forensic. Halfords’ car care guides cover the DIY product side well, and the RAC’s bodywork advice helps you judge when DIY ends and professional begins.
Prevention beats cure: keep a generous distance from lorries and gritters on motorways (most chips come from the vehicle ahead), consider paint protection film on the bonnet’s leading edge and mirror caps if you do big motorway miles, and wash regularly — clean paint reveals new chips while they’re still treatable. If the car’s overall condition has you questioning the economics, our guide to car ownership versus car clubs frames the bigger decision.
The bottom line
Touching up stone chips is a £20, one-hour job that prevents £300 rust repairs — the highest-return maintenance in car care. The method: correct paint code, meticulous cleaning, complete rust removal first, thin layered application with a cocktail stick (never the chunky pen brush), lacquer for metallics, and gentle levelling only after full curing. Less paint, much more patience. Your bonnet will thank you, your MOT tester won’t notice, and future-you won’t be paying for a respray.
Frequently Asked Questions
Can you touch up stone chips yourself?
Yes — chips up to ~5mm are very DIY-able with touch-up paint matched to your paint code, applied in thin layers with a fine applicator. The keys are proper cleaning, rust removal first, and patience: thin coats, not blobs. Larger damage or spread rust needs professional SMART repair or bodyshop work.
How do I find my car’s paint code?
On the door jamb sticker, under the bonnet, in the boot, or in the handbook — location varies by manufacturer. Order touch-up paint by this code, not by colour name. Your dealer’s parts department or online specialists can supply it; expect £10–£20 for a pen or bottle.
Will touch-up paint rust if applied over rust?
Yes — painting over rust seals moisture in and the corrosion continues underneath, eventually bubbling through. Always remove rust completely first (sanding, fibreglass pencil, or rust converter for stubborn spots) before touching up. This step is non-negotiable.
How long does touch-up paint take to dry?
Touch-dry in 30–60 minutes, but allow 24–48 hours for full curing before wet-sanding or polishing. Apply thin coats with at least 30 minutes between them. Rushing the cure is a top cause of visible, lumpy repairs.
Is it worth getting stone chips professionally repaired?
For chips over ~5mm, clusters of damage, dents, or spread rust: yes — SMART repair technicians charge £80–£200 for localised repairs, far less than bodyshop resprays (£300–£600 per panel). For small isolated chips, DIY at £20 is the value king.