One stage or two? How we decide on every correction job

Every correction job at the studio starts with the same boring step: a paint thickness gauge and a panel diagram. We measure, we log, and only then do we decide whether the job is one-stage or two-stage. Here's why we work this way.

What a stage actually is

One "stage" is one combination of compound + pad type. A one-stage correction uses a single, balanced compound (we typically run Koch-Chemie H8.02 on a microfibre pad) that cuts and finishes in the same pass. It removes lighter swirls and leaves a clean, hologram-free finish.

Two-stage means we follow that with a finishing polish on a softer pad to refine away any cutting marks. On dark, sensitive paints (Mercedes obsidian black, Tesla midnight silver, BMW Carbon Black), two-stage is almost always required to leave a true-to-paint finish.

The measurements that decide it

Factory clear coat is typically 50–70µm thick. Each correction stage removes 1–3µm of clear coat. So on a healthy modern car (130–160µm total paint), two stages cost roughly 5µm — barely a dent. On a panel that's been resprayed (sometimes as low as 90µm total), the same job risks burning through.

This is why the gauge comes out first. If a panel reads under 90µm, we drop to a one-stage approach on that panel only — even if the rest of the car gets two-stage. We log every reading on a printed diagram so the client can see what we measured.

What the swirl-finder light reveals

Sunlight hides as many defects as it reveals. Halogen swirl-finders concentrate light into a single source, and that single source bounces back through the clear coat at every angle. Marring, holograms, water spots and oxidation all become unavoidable to see.

We run two of these along the bay. The car spends time under both — once before correction, once after — and we sign off panel by panel.

"If you can't see the problem clearly, you can't fix it precisely. Lighting is half the trade."

What we won't promise

We can't remove deep scratches that have cut through the clear coat into the colour. Those need touch-up paint or panel repair, and we'll say so. Anyone who promises to "polish them out" is going to remove a lot of clear coat trying.

We also can't fix orange peel without wet-sanding, and we wet-sand only when the clear coat measurement supports it. Nine times out of ten, leaving the orange peel is the right call.

Pairing correction with protection

A correction without protection is half the job. Within days of perfect paint, the next wash will introduce light marring again. That's why most of our correction work happens immediately before a ceramic coating or, for clients who prefer a softer look, a carnauba wax.

Booking

Send three or four phone photos of your car under direct sunlight, ideally on dark panels. We'll respond with one-stage or two-stage, an estimated cost, and the next available day. The whole conversation usually takes a single thread on WhatsApp.