The Short Answer
Wash the scratch, let it dry, then run your fingernail across it. If your nail glides over without catching, the scratch is in the clear coat and a detailer can usually polish it out. If your nail catches — or you can see primer or bare metal — no amount of buffing will fix it, because the color layer is gone.
Clear-coat scratches are a detailer job (paint correction, from $499). Through-the-paint scratches need touch-up paint or a body shop. Knowing which one you have before you pay anyone saves you from buying the wrong repair.
The Fingernail Test, Exactly How to Do It
Wash the area first. Dirt and wax in the scratch lie to you — a dirty scratch always looks worse, and wax can temporarily fill a shallow one and make it look better than it is. Clean, dry paint gives you the truth.
Drag your fingernail perpendicular across the scratch — across it, not along it — with light pressure. You are feeling for a groove. If your nail slides over with no interruption, the scratch is shallow: it has only disturbed the clear coat. If your nail catches, dips, or clicks into a channel, the scratch goes through the clear coat and into the color or primer.
Check in good light from multiple angles. Some scratches look deep because of white residue packed into them — often just clear-coat dust or wax — and clean up far better than they first appear. The nail test after washing is the reliable read, not the first glance in a parking lot.
Reading the Layers: Clear Coat vs. Color vs. Primer
Car paint is a stack: metal, primer (usually gray), color coat, then clear coat on top. A clear-coat scratch looks white or light gray against the paint — that is just light scattering in the damaged transparent layer. It looks dramatic on dark colors and barely visible on silver, but the depth is the same.
A scratch into the color coat shows the color disrupted — the line looks darker or a different shade than the surrounding paint. A scratch into primer shows gray or light-colored material in the groove. Bare metal shows shiny silver (or rust, if it has been exposed a while).
Why this matters: polishing works by leveling clear coat. It can only fix damage within the clear coat. Once color is missing, there is nothing to level — polishing a primer-deep scratch just makes a shinier primer-deep scratch.
What Buffing Can and Can't Do
Buffing — machine polishing — removes a microscopic layer of clear coat around the scratch until the surface is level with the bottom of the scratch. Shallow clear-coat scratches disappear completely. Medium ones improve dramatically and become invisible except in specific light.
What it cannot do: replace missing color or fill a groove you can feel with your nail — buffing a felt scratch just removes clear coat around the groove without ever leveling it, thinning paint for nothing. It also cannot fix scratches where the clear coat is already thin from previous corrections. A good detailer measures paint depth before heavy correction and will tell you when a scratch is at the limit.
Beware the hand-rubbing-compound approach on anything beyond light marring. Rubbing compound is aggressive, and working it by hand produces uneven results — dull spots and holograms around the scratch that look worse than the original problem. Deep scratches treated this way usually end up at a body shop anyway, plus a correction bill.
The Honest Cost Ladder
Clear-coat scratches: a detailer's paint correction, from $499 for our service. This handles everything the nail test says is shallow, plus usually improves medium scratches substantially.
Small chips and short through-paint scratches: touch-up paint, either a factory pen ($15–30 DIY) or a professional touch-up service. Technique matters: dab, don't brush-stroke — a fine-tip brush, light coats, and clear over it. It will not be invisible — anyone telling you touch-up paint is undetectable is selling something — but it seals the paint against rust and looks fine from a few feet away.
Long, deep, or dented scratches: a body shop respray of the panel. This is real money — hundreds per panel — which is exactly why the 30-second nail test matters. Paying for a detailer first when you needed a body shop wastes the detailer's fee; going straight to a body shop for a clear-coat scratch wastes hundreds.
One more cost people forget: bare metal rusts. In humid Texas, an exposed-metal scratch left through a rainy season becomes a rust repair, which costs multiples of what the original scratch would have. Seal it with touch-up paint promptly even if you plan a proper repair later.
What We Do When You Send Us a Scratch Photo
Send a clear photo in good light — and tell us the nail-test result. We will give you a straight assessment: detailer-fixable, touch-up territory, or body-shop job. If it is a body-shop job, we will say so rather than sell you a correction that cannot fix it.
If it is fixable, we will quote it firmly before anyone touches the car. That is our rule on every service: the number is set before the work starts, not negotiated in your driveway.
Call or text (214) 865-8825 — we are here 8am–11pm daily — or book online. The assessment costs you nothing and takes about a minute.