Diamond Coating
Quick answer: “Diamond coating” is a marketing term for wipe-on, silica-based protectants that promise diamond-like hardness. They cure as a thin, clear film that improves gloss, chemical resistance and water behaviour. It is not real diamond or DLC and it is not scratch-proof.
A diamond coating is similar to a ceramic coating, but uses carbon in the form of synthetic diamond nano-rods instead of silica.
What it means
Automotive “diamond” coatings are usually polysiloxane/SiO₂ ceramics or polymer sealants with diamond-themed branding. Some claim nano-diamond or “diamond dust” additives, but these do not create a fused diamond layer. True diamond-like carbon (DLC) or diamond films require PVD/CVD deposition in controlled equipment - not achievable by wiping on a liquid. Real-world performance depends on surface preparation, application conditions and aftercare.
Why it matters
- Expectation setting: avoids confusing Mohs hardness claims with pencil hardness and day-to-day mar resistance.
- Decision quality: compare prep standards, film uniformity and chemical resistance - not the word “diamond”.
- Maintenance: behaves like other ceramics - easier cleaning, hydrophobics, benefits from sensible wash routines and toppers.
Where you’ll see it
Retail “diamond” ceramics and dealer packages, plus some pro ranges that use diamond branding for premium tiers.
Context
Car Paint Protection; Ceramic coatings; Marketing claims
Common mistakes
- Taking “diamond” literally - wipe-on liquids cannot create a diamond or DLC layer on paint.
- Confusing Mohs hardness with pencil hardness - 9H pencil ≠ Mohs 9.
- Expecting scratch-proof or chip resistance - coatings resist light marring; PPF handles impact better.
- Skipping decon, polish and residue-free panel wipe - leads to weak bonding and high spots.
- Applying to windscreens and causing wiper judder - use a dedicated glass coating instead.
Written by Danny Argent. Last updated 10/11/2025 15:19
Further Reading
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🍀 Is a Ceramic Coating Worth it?
Ceramic coatings are expensive, there's no getting away from that. So the question has to be asked, are they worth the money? -
🍀 What are the drawbacks of a ceramic coating?
We asked Artificial Intelligence to tell us the downsides of a ceramic coating, then reviewed the result.
Services
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🔥🔥🔷 Car Ceramic Coatings
We offer a range of Graphene, Diamond and Ceramic Coatings for cars of all types. -
🔷 Exterior Car Detailing
Our exterior detail prepares your car's exterior, and is an essential step in the process if you are having paintwork restoration, polishing and ceramic sealants.