Blending: making sure the repainted panel doesn't show

You get a quote to repair the front door and notice that the rear door or the wing is also listed for paint, even though they have no damage. Why? The answer is almost always blending, a technique with one very specific goal: that nobody can tell which panel has been painted.

The problem: the same colour isn't the same colour

Every car has a factory paint code, and that gives a formula. But the paint on your car is not exactly the formula: there are small differences between factory batches, and on top of that sunlight, washing and time gradually shift the shade. In southern Tenerife, with so many hours of sunshine, this is particularly visible on bonnets, roofs and wings.

The painter adjusts the mix to bring it closer to your car's actual shade, but even an excellent match can leave a tiny difference. And the human eye is very good at spotting colour differences when two areas sit side by side, separated by a straight line such as the gap between two doors.

The solution: a gradual transition

Blending means not stopping the new colour at the edge of the repaired panel, but extending it more and more thinly onto the neighbouring panel until it fades out. Instead of a sharp change along a line, there is a transition so gentle that the eye does not pick it up.

With two-stage paint, the usual approach is to blend the base coat across part of the adjacent panel and then apply clear coat over that whole panel, edge to edge. That way the surface is even in gloss and texture, and the colour merges without any visible start to the new paint.

When it's needed

• Metallic and pearl colours. These are the most demanding: the effect changes depending on how the particles lie, and that depends on the application. They are almost always blended.
• Cars that are a few years old. The more the original shade has shifted, the more useful blending becomes.
• Large panels next to other large panels. A door next to a door, or a wing next to the bonnet, are compared at a glance.
• Solid colours on newer cars sometimes do not need it, because the colour match alone may be enough. It is judged case by case.

How it's prepared

The neighbouring panel has no damage, but it still needs preparation. It is thoroughly cleaned, given a fine key so the new clear coat bonds, and its rubbers and trims are carefully protected. The transition zone is especially delicate: the surface is left very fine so that the step from old clear coat to new does not show.

Does it cost more?

A little: it means material and labour on one more panel. But the alternative is a repair where anyone can see which panel was painted, something that bothers you every time you look at the car and reduces its value if you ever sell it. So when the colour calls for it, we include it in the quote and explain why.

A good paint repair doesn't show. Blending is what makes that possible.

To see how we match colours, have a look at our partial respray and colours and finishes pages, or ask for a quote for your car.