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Ceramic Fills Scratches
Quick answer: Myth. Ceramic coatings do not fill or remove scratches. They cure as a very thin, hard, clear film that can mask light haze slightly, but true scratches and swirls remain until they are polished out or refinished.
What it means
"Filling" implies adding material to level a gouge. Wipe-on ceramics cure in a sub-micron to microns-thin layer and follow the existing surface - they don't level defects like fresh clear coat. Glazes and oily polishes can temporarily hide micro-marring (until washed), while paint correction actually removes a tiny amount of clear to level the defect. Ceramics mainly add chemical resistance and easier cleaning; they are not body filler.
Why it matters
Coatings are microns thick, which settles the question before anyone opens a bottle. A film that thin cannot fill a scratch with any depth to it, so a coating improves resistance and appearance without erasing what is already there.
Sequence follows from that. Proper decontamination and machine polishing have to happen first if the result is going to look genuinely glossy, because the coating preserves the surface it finds rather than improving it. Skip that and the finish is locked in as it was: on a dark colour every swirl stays visible under raking light, now sealed beneath something durable.
Understanding the split also makes the quote readable, since correction time and coating application are separate costs, and a price that looks low usually means one of them has been left out.
Which claims to check
Marketing claims, customer FAQs before booking, and after DIY applications where swirls seem unchanged once the car is in sunlight.
Context
The idea that a coating fills scratches sits with self-healing and scratch-proof among the expectations that cause the most disappointment. A coating follows the surface it is applied to, so anything visible beforehand stays visible, which is why correction has to come first.
Common mistakes
- Skipping correction: applying ceramic over swirls expecting them to disappear.
- Over-applying to "build thickness": thicker wipe-on layers just streak and create high spots; they don't level scratches.
- Confusing glaze with coating: temporary fillers can hide marks until the first strong wash or panel wipe.
- Taking "self-heal" literally: ceramics resist light marring; PPF is the product with credible heat-assisted swirl recovery.
- Judging under shop lights only: always check under raking light and daylight to assess remaining defects.