Depth decides
The fingernail test
Automotive paint is layered: primer on the metal, base coat carrying the color, clear coat over the top providing gloss and UV protection. The clear is typically somewhere around 40 to 60 microns thick — roughly the thickness of a sheet of paper, and there is only so much of it to work with.
Drag a fingernail lightly across the scratch. If it glides over without catching, the damage is within the clear coat and polishing will very likely remove it entirely. If your nail catches, the scratch has gone through into the base coat or deeper, and no amount of polishing brings it back — polishing removes clear coat to level the surface, and you cannot level down to a depth that no longer has clear coat in it. That case needs touch-up, wet sanding by someone who does that work, or a body shop.
Categories
What we see and what happens to it
Wash swirls
Fine circular marring across the whole vehicle from poor wash technique or tunnel washes. Polishes out completely and is the most satisfying category to correct.
Fingernail scratches
The arcs around door handles from keys and rings. Almost always clear coat only, and almost always fully removable.
Car park scrapes
A door edge or shopping trolley. Often a transfer of paint from the other object sitting on top of yours, which comes off cleanly. If it cut through, it needs more than polishing.
Branch and brush scratches
A drive down a narrow alley in Fairmount or a tight driveway. Usually shallow and multiple, and they respond well to correction.
Deep key scratches
Almost always through the clear and into the base or primer. Polishing improves the appearance of the edges but the line stays. Body shop work.
Bumper scuffs
Plastic bumper covers flex and their paint behaves differently. Light scuffs correct; cracked or gouged plastic is repair work.
Method
Removing the least clear coat that solves the problem
- Wash and decontaminate first so polishing does not drag grit across the panel
- Inspect the damage under focused lighting from several angles
- Assess remaining clear coat thickness before committing to an aggressive step
- Test spot with the mildest combination of pad and compound that could work
- Escalate only where the test proves it necessary, and only on the affected area
- Refine the polished area so it matches the surrounding gloss rather than standing out
- Protect the corrected paint, since polishing leaves it bare
Honesty
When we tell you not to bother
Clear coat is finite. Every correction consumes some, and a panel that has been polished repeatedly over its life can reach a point where further work risks burning through to the base coat — a failure that costs a repaint. On older vehicles, or ones with unknown history and evidence of previous work, the responsible answer is sometimes that we can improve a scratch by seventy percent safely, or remove it entirely at a risk we are not willing to take with your paint.
We will also tell you when a scratch is not worth the money. A single deep key line on a ten-year-old daily driver may be better left alone, or handled with touch-up, than paid for as a correction that cannot succeed. Selling work that will not deliver is how this trade gets its reputation, and we would rather lose the job.
FAQ
Common questions
Can you remove a scratch that catches my fingernail?
Not completely. That scratch has passed through the clear coat, and polishing only removes clear coat — it cannot rebuild what is gone. We can soften the edges so it catches the light less, which often makes it much less noticeable, but the line will still be there under close inspection.
Do scratch removal pens or kits work?
Filler products temporarily hide fine scratches and wash out within weeks. Touch-up paint fills a deep scratch to stop it rusting, which is useful, but it rarely looks invisible. Neither one removes anything. For clear coat damage, machine polishing is the process that actually works.
How much clear coat does polishing remove?
A light finishing polish removes very little — a fraction of a micron. Heavier compounding removes more. This is why the method starts with the mildest approach that could work and escalates only as proven necessary, and why we check what is there before starting on an older vehicle.
Can you fix just one panel?
Yes, and it is a common request. The caveat is contrast: a perfectly corrected door on a car with swirled paint everywhere else can look mismatched under sunlight. We will point that out and let you decide whether to correct the surrounding panels too.
Is the repair permanent?
Yes, when the scratch is genuinely removed. Unlike filler products, polishing physically levels the clear coat, so the defect is gone rather than hidden. It will not reappear. New scratches, of course, can be introduced by poor washing, which is worth knowing before booking a tunnel wash the following week.
Ready to book mobile detailing?
Tell us the vehicle, its current condition and where it will be parked, and we can put together a quote and a time that works.