Defects
Can old scratches be removed?
Depth decides this, not age. A forty-year-old scratch that sits in the top of the finish can often be removed completely. A shallow one from last week that has gone through to primer cannot.
Scratches sit on a spectrum. At one end, fine wash marks and light surface scratching that live in the uppermost part of the coating — these usually come out. In the middle, deeper scratches that can be significantly improved and made much harder to see without disappearing entirely. At the far end, scratches that have gone through the paint to primer or metal, which are a repair rather than a polishing job.
The old fingernail test is a reasonable home guide: run a nail gently across the scratch. If it catches, the defect has depth, and the realistic goal is improvement rather than removal. If it does not catch, there is a good chance it can be dealt with properly.
The variable that matters most on a classic is not the scratch. It is how much paint surrounds it, because removing a scratch means working the finish down to its base — and on old paint the question is always whether you can afford to.
Philosophy
Should every scratch on a classic be removed?
No. And this is one of the places where Mercenary’s approach differs most clearly from a shop selling maximum correction.
If taking out the last trace of one deep scratch means going noticeably harder across a whole panel of irreplaceable original paint, that is a bad trade. You have spent material you cannot replace, across an area far larger than the defect, to remove something most people would never have noticed.
A smaller scratch is better than a missing piece of original paint.
The better outcome is usually partial: take the scratch down until it stops catching the light, leave the rest, and keep the paint. Nine times out of ten the owner cannot find it afterwards without knowing exactly where to look — and the panel still has a future.
You will be shown the specific defects where this call applies, told what full removal would cost in material and risk, and asked what you want to do. It is your car. But the recommendation will be honest, including when the honest recommendation is to leave something alone.
Defects
Can classic paint be wet sanded?
Wet sanding is a legitimate professional refinishing technique in the right circumstances. It is also substantially more aggressive than machine polishing, and it should never be treated casually on unknown or irreplaceable classic paint.
It is not a default step in correction, and it is not a badge of thoroughness. It is a specific tool for specific situations — most often fresh refinish work, where there is known, plentiful, recently applied material and a clear objective such as removing texture from a new respray.
What sanding requires before it is even considered
- Knowing what the paint is — not guessing
- Enough material to work with, confirmed rather than assumed
- Controlled technique and the ability to finish the sanded area back to full gloss afterwards
- Edge awareness, since edges are where sanding does its damage fastest
- Knowledge of previous repairs, because sanding into a blend edge is difficult to undo
- A clear objective that could not be reached any other way
It is worth knowing that even during ordinary machine polishing, it is effectively impossible to see how much material is coming off in real time — which is why gauge manufacturers advise measuring before and after any sanding or buffing. Sanding removes more, faster, with less feedback. On a car whose paint history is unknown, that combination is exactly the wrong one.
Just because a defect can be sanded does not mean it should be.
If sanding is genuinely the right call on your vehicle, you will be told why, what it involves, and what it costs in material — before anything happens, not after.
Defects
Can polishing damage original pinstriping or graphics?
Yes, and this is one of the genuine irreversible risks on older vehicles. Hand-painted stripes, period decals, factory graphics and painted details can be fragile, sit proud of the surface, and be effectively impossible to replace.
Hand-laid pinstripes in particular sit on top of the paint rather than in it, which puts them directly in the path of a pad. Old decals and transfers may have become brittle. Painted lettering and coach lines may have thinned to the point that a single careless pass takes them off — and once a period-correct stripe is gone, matching it again is a specialist job at best and impossible at worst.
The options, chosen to fit the specific vehicle:
- Reduced aggression in the surrounding area, accepting a slightly lower result nearby
- Masking the detail off entirely so the machine cannot reach it
- Hand treatment around and over it, where appropriate
- Complete avoidance — leaving a defined zone untouched
If your vehicle has graphics you care about, say so when you phone. Preserving them will usually matter more than achieving perfectly even gloss across every square inch, and that is a decision worth making deliberately rather than discovering afterwards.
Defects
Why are edges and body lines more sensitive?
Because paint tends to be thinner where a panel curves sharply, and because a pad concentrates its work on a raised edge instead of spreading it across a flat surface. Less material, more contact — which is why edges are where things go wrong first.
What you need from that, as an owner, is not a technique lecture. It is this: on your vehicle, the ridge along the top of the wings, the crease down the doors, the lip around the arches and the sharp fold of a bonnet are the highest-risk areas on the car, and they are also the ones a hurried operator is most likely to run a pad straight over.
Those areas get treated with more caution, less pressure and often by hand. Occasionally they get left alone deliberately. If you have bought a used classic and want to know whether someone has been careless with it before, the edges are the first place to look — a pale, colour-shifted line along a crease is what previous over-polishing tends to leave behind.