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Glossary Techniques & prep

Decontamination

Definition

Why does decontamination come before a coating?

  • Decontamination is the prep step that removes bonded contaminants — iron fallout, tar, industrial fallout — that a normal wash leaves behind, often with a chemical iron remover and a clay bar.
  • Skipping it traps grit under film or coating and ruins the finish.

Why it matters to a shop

Skipped decon is the single most common reason a coating or a film fails early, and the failure surfaces months later as a warranty job on your dime. Quoting it as a visible line, rather than absorbing it, is how the prep hours stay in the price. Keeping the prep hours in the price is auto detailing business software.

FAQ

Decontamination questions, answered

What is the difference between chemical and mechanical decontamination?

Chemical decontamination dissolves what is bonded to the paint — an iron remover for brake dust, a solvent for tar. Mechanical decontamination shears off what is left, usually with a clay bar or mitt over a lubricated panel. Most jobs need both, in that order: chemicals first so the clay has less to drag, then clay for the particles chemicals cannot reach.

Do you have to decontaminate before a ceramic coating?

Yes, and skipping it is the single most common reason a coating or a film fails early. Anything bonded to the panel is sealed under a layer built to last years, and it surfaces months later as a warranty job on the shop's time. Quote decontamination as a visible line rather than absorbing it, so the prep hours stay in the price.

How do you know the paint is decontaminated?

By feel. Slide a clean hand inside a plastic bag over a dry, washed panel: bonded contamination reads as a rough, gritty surface, and decontaminated paint reads as glass. It is a check a customer can do standing beside you, which makes it one of the easiest prep steps in detailing to justify on a quote.

Go deeper

Related terms

More from techniques & prep — How the work actually gets done in the bay.

Paint correctionMachine polishing that removes swirl marks, scratches and oxidation from clear coat to restore gloss and clarity. Graded by steps — a 1-step refines, a 2- or 3-step removes progressively deeper defects — and priced off the paint's condition and the bay hours it takes.Swirl marksFine, spider-web scratches in the clear coat, usually from improper washing and drying. They're most visible on dark paint under direct light and are removed by paint correction, not by wax or a quick polish.Clear coatThe transparent top layer of a factory paint system that provides gloss and UV protection. Paint correction works within the clear coat; cutting through it exposes the colour layer and means a respray, so measuring paint thickness matters.Clay barA malleable resin bar (or mitt) dragged across lubricated paint to pull off bonded contaminants the wash missed, leaving glass-smooth paint ready for correction, coating or film.Cure timeThe window a coating or adhesive needs to fully harden or bond before the vehicle is exposed to water or delivered. Ceramic coatings need protected cure time; PPF adhesive keeps bonding for days after install. Scheduling has to leave room for it.Cutting plotterA computer-driven cutter that cuts PPF or tint to a vehicle-specific pattern from a software library, instead of bulk hand-cutting on the car. It speeds installs and reduces waste, though every job still leaves some offcut. Service VIN does not cut film and does not replace a plotter: it prices the job, tracks the roll the pattern comes off, and books the bay the cutter feeds.

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