Why coastal cars
lose their wheels first

We work across about twenty miles of coast and inland, on the same makes of car, and the difference is stark enough that we can usually guess the postcode from a photograph.

Salt does two jobs

Airborne salt settles on everything within a mile or so of open water, and it is hygroscopic — it pulls moisture out of the air. That means a salt-covered wheel stays wet long after it looks dry.

Then in winter it meets road salt, which is the same chemistry in much higher concentration. Between them they give aluminium exactly what it needs to corrode: moisture, salt and time.

It starts at the gaps

A healthy coating has no way in. Corrosion starts wherever that seal is broken: a stone chip, a kerb scuff, or on diamond-cut wheels a microscopic gap at the rim edge from the day it was made.

Once underneath, it lifts the coating from below, which opens a bigger gap, which lets in more moisture. That is why it accelerates rather than staying still.

There is more detail on the diamond-cut version of this in the white worm article.

What actually helps

1. Rinse the wheels after winter drives. Plain water is enough; you are removing salt, not cleaning.
2. Use a pH-neutral wheel cleaner rather than an acid one. Acid attacks the coating you are relying on.
3. Get chips and scuffs sealed early rather than waiting for the set to need doing.
4. Consider a ceramic sealant after any refinishing. On the coast it earns its money.

None of that stops corrosion permanently. All of it buys years, and the first two cost nothing.

Is refinishing worth it if it will happen again?

Yes, provided it is done properly. A wheel stripped to bare metal, coated and sealed will last years even on Hayling. What does not last is coating over existing corrosion, which buys about eight months.

If your wheels are already blooming, the honest answer is that it will not stop on its own and it gets more expensive the longer it runs. A full refurbishment now costs less than a replacement later.