How Much Paint Is on a Car, and Why Polishing Has a Limit

In direct sun you can see a web of fine circular marks and smears on the bonnet; in the shade there is no trace of them. The obvious answer is to have it polished out, and it does go away – by taking the top gloss layer of the paint a little thinner. That layer does not grow back.

There is a finite amount of paint on a car, and every correction takes some of it. That is why, before any work starts, we ask you two things: how many times someone has already been over this car with a machine polisher, and whether it has ever been in a body shop.

We measure the paint thickness during the inspection. But the gauge only tells us how much is on the panel today – where that number came from, only you know.

How many times this car has already been polished

On a car you did not buy new, usually nobody knows the history of the surface. It is polished before a sale almost every time, and after body repair as well, and on a finished panel there is nothing to see: it looks good and gives nothing away.

A gauge held against the bonnet shows the thickness in one spot. It will not tell you whether the reading is low because two people have already taken material off the layer, or high because there is body-shop paint underneath. And that is exactly what decides how much we can afford to do on that panel.

Your answer does not have to be precise. Even "no idea, I've had the car two years" is enough for us to work with a bigger margin.

When the car has been in a body shop

From the factory, paint is baked at over 140 °C. That gives it a uniform, dense structure you can rely on during correction.

Paint applied at a body shop cannot be baked that way; the car would not survive the temperature. It is cured lower, usually no more than around sixty degrees, and its durability comes from chemical hardeners instead of heat. Several different systems are used for this, and each behaves a little differently under the pad.

For us that means a repaired panel is not the same as the one next to it, even if it reads better on the gauge because there is more paint on it. When we know about the repair in advance, we plan for it. When we do not, we find it during the work, and that is the worse version.

Why the marks come back sooner on one car than another

Paint hardness varies from car to car, and we can tell during the inspection and on a test spot. Harder paint is common on BMW, Audi, Mercedes-Benz or Aston Martin; softer paint has traditionally been found on Honda, Fiat or Alfa Romeo. It is a guide, not a rule – we check it on your car.

On hard paint we need a more aggressive cut for the same defect, and that cut takes more off the layer. Soft paint levels easily, but it also scratches from something as ordinary as wiping, so the fine circular marks show up again sooner – and with them the urge to polish again.

That is why the same reserve lasts one car for several corrections over its life, and another car uses it up in a few seasons.

When too much has been taken off the layer

It is not the whole gloss layer that protects the colour from the sun, but its upper part. That is what gets thinner first with every polish, and there is nothing to see yet: the surface still shines.

You notice it only when the colour underneath starts to fade, first on the roof and the bonnet. Faded colour cannot be polished out, only resprayed, and that is different work and different money.

So on a car that has already been through several rounds of polishing, the answer is sometimes to leave the paint alone.

What we will tell you after the inspection

We measure the thickness in several places, add what you tell us about the car's history, and out of that comes the scope: whether it makes sense to go over the whole car, or only the panels where it is worth the material.

We call it correction, not polishing, and there is a difference. Polishing removes the defect and does not address what it did to the rest of the layer. Correction takes into account how much layer is left, and chooses from there how deep to go and how to finish the work.

That is why we quote a price only after the inspection. Until we know how much paint is on the car and what has been done to it, we do not know how much work can be done on it either.

When you do not want to keep polishing

After correction the paint can be covered with a protective layer. It sits on top of the paint as a separate layer, so it will not give you back what has been taken off – but the wear goes into it and puts off the point where material has to come off again. It will not rule the marks out entirely, but they come back more slowly.

Unlike correction, we know the price for it in advance: we offer ceramic surface protection and basic surface protection, depending on how long you want the protection to last. Actual lifespan then depends mostly on where the car is parked and driven.

What happens next

Tell us how many times the car has been polished, whether it has ever been in a body shop, and what is bothering you about the surface. If you do not know, say that too – we will work out from there what to expect from correction.

Ask about paint correction