Car scratch? Here's how to tell whether it's a DIY fix or a job for the professionals
It often takes only a moment for an unwanted scratch to appear on a vehicle. A shopping trolley rolls into a door, a parking manoeuvre ends too close to an obstacle, or another motorist opens a door without noticing the car next to them. What was once a spotless vehicle can suddenly be marked by an unsightly scratch.
Fortunately, not every scratch requires an expensive repair. According to Keagan Sloman, Head of Product and Commercial at The Unlimited, the first step is understanding exactly what type of damage has occurred before attempting any repairs.
“Not all scratches are created equal, and not every mark that looks like a scratch actually is one,” says Sloman. “Sometimes it is simply paint transferred from another object rather than damage to your vehicle's paintwork. In other cases, it may be nothing more than a light surface mark. Then there are scratches that go much deeper. The important thing is knowing what you are dealing with before acting.”
Start with the fingernail test
Modern vehicle paint systems typically consist of multiple layers, including primer, colour and a protective clear coat. Determining how deeply a scratch has penetrated those layers can provide a useful indication of whether a DIY repair is possible.
Sloman recommends a simple assessment known as the fingernail test.
“Run your fingernail gently across the scratch. If your nail glides over the mark without catching, there is a good chance the damage is limited to the clear coat. Those lighter scratches can often be reduced or removed with the correct polishing product.”
If the fingernail catches in the scratch, however, or if a different colour beneath the paint becomes visible, the damage may extend beyond the surface layer. Exposed primer or bare metal generally indicates a deeper repair that may require professional attention.
Sloman notes that the fingernail test should be used as a guideline rather than a definitive diagnosis.
When polishing can help
There is an important difference between concealing a scratch and removing it completely.
Some wax-based products can temporarily hide fine scratches by reducing their visibility. Polishing compounds, on the other hand, may help remove or significantly reduce shallow surface scratches by smoothing imperfections within the clear coat.
Before using any repair product, motorists should ensure it is suitable for their vehicle’s paint finish. Products designed for glossy paint surfaces can leave unwanted shiny patches on matte or satin finishes.
Sloman recommends thoroughly cleaning the damaged area before beginning any repair process.
“Always wash and dry the area properly first. If dirt or grit remains on the surface, you could end up creating additional scratches while trying to remove the original one.”
Following product instructions carefully is equally important. Excessive pressure can cause additional damage rather than improve the result.
“The important word is light,” says Sloman. “More pressure does not automatically produce a better result. Many polishing products contain abrasives, and overusing them can damage the surrounding paintwork.”
Know when to call in the experts
For deeper scratches, chipped paint, exposed metal or damage accompanied by dents, Sloman advises seeking professional assistance.
“Sometimes what looks like a minor cosmetic issue is more complicated than it appears. A professional can properly assess the damage, explain the repair process and provide an indication of the likely cost.”
Ignoring deeper scratches can also lead to more expensive repairs later. Once protective paint layers have been compromised and metal becomes exposed, moisture can trigger corrosion, allowing a relatively small issue to develop into a much larger problem.
Preventing bigger problems
Scratches may be an unavoidable part of everyday motoring, but understanding the severity of the damage can help motorists make the right repair decision.
A careful inspection, the correct products and professional assistance when necessary can often prevent minor cosmetic damage from becoming a costly repair. By addressing scratches early and appropriately, vehicle owners can protect both the appearance and long-term value of their vehicles.
