6 Common Myths About Ceramic Coatings, and What Is Actually True
Ceramic coatings have become one of the most talked-about products in car care, and with that comes a lot of misinformation. Some of it comes from forums, some from over-enthusiastic advertising, and some from genuine confusion about what a coating actually is. Here are the six myths we hear most often from UK drivers, and what is really true.
Myth 1: Ceramic coatings and quartz coatings are different things
They are the same thing. Most ceramic coatings are built around silicon dioxide, SiO2, which is the compound that makes up quartz. "Ceramic", "quartz" and "SiO2" are simply three names for the same type of product.
The confusion is kept alive by price lists that offer a "quartz coating" and a "ceramic coating" as separate services, usually at different prices. What actually differs between coatings is the formula, the concentration of active ingredients and how long they last, not the name on the menu.
There are genuinely different types, though. Graphene-ceramic coatings, such as the InteliGraph series, add graphene to the SiO2 base for extra flexibility and depth of colour. That is a real difference in chemistry. Ceramic versus quartz is not.
Myth 2: A coating makes your paint scratch-proof
This is the most damaging myth of all, because it sets people up for disappointment.
A good coating is harder than factory clear coat and noticeably more resistant to the light marring caused by washing and drying. It is also slicker, so a mitt or towel glides across it with less friction. Both of those mean fewer swirl marks over the years.
But road grit and sand are largely quartz, which is harder than any coating you can put on a car. Drag grit across a coated bonnet and it will still scratch. A coating will not stop stone chips, will not survive a key, and will not protect against a careless brush at a hand car wash. For real impact protection you need paint protection film.
Be wary of hardness figures above 9H, too. 9H is the top of the pencil hardness scale used to test coatings, so 10H, 11H and 12H are marketing, not test results. We explain the two hardness scales in how hard is a ceramic coating and what 9H actually means.
Myth 3: A coated car does not need washing
We wish this one were true. A coating makes the surface very water-repellent, so rain beads up and runs off, taking loose dirt with it. Traffic film and dust struggle to bond. The car genuinely stays cleaner for longer, and when you do wash it, the dirt comes away with far less effort.
But it still gets dirty. Winter salt, brake dust, bird droppings and the grime thrown up on a wet motorway all land on a coated car just the same. What changes is how long they take to build up and how easily they come off.
Myth 4: Once it is coated, you can wash it with anything
How you wash a coated car makes a big difference to how long the coating performs.
Automatic car washes with spinning brushes will mark coated paint just as they mark uncoated paint. Harsh traffic film removers and strong degreasers used week after week wear the coating down faster than normal washing. Stick to a safe hand wash with a proper mitt and a gentle shampoo.
There is a subtler problem too. Regular washing with pH-neutral and alkaline products, which is exactly what most people use, gradually leaves mineral deposits on the surface. Over months, these clog the coating. The beading weakens and the car stops washing as easily, and many owners assume the coating has worn off when it is actually still there underneath.
The fix is a periodic service. Ultracoat recommends one every 6 months or 6,000 miles: a wash with an acidic shampoo such as Bubble Shock to dissolve the mineral build-up, followed by full decontamination. That restores the coating's original properties.
Myth 5: You can coat straight over your existing paint
A coating bonds to whatever is on the surface when it goes on, and it locks that surface in. If the paint has swirls, scratches, old wax or polishing oils on it, the coating seals all of that in place. Scratches can even look more obvious, because the extra gloss draws attention to them.
That is why proper preparation comes first: a thorough wash, iron and tar decontamination, paint correction where needed and a final degrease with a panel wipe such as Finest Wipe.
This applies to new cars as well. Most new cars have been moved around the factory, transported, stored and washed at the dealership before you collect them. Light marring from that process is common, and a new car usually benefits from at least a light polish before coating.
Some paint is simply past coating. Heavy oxidation, failing clear coat or corrosion need repairing first, and a coating cannot fix them.
Myth 6: A coating lasts the number of years on the bottle, no matter what
Durability ratings are a guide to what a coating can achieve under reasonable use, not a guarantee regardless of how the car is treated. That is why most are given in both years and miles.
A car covering 15,000 motorway miles a year and parked outside through a British winter asks far more of a coating than a weekend car that lives in a garage. How the coating was applied, how the car is washed and whether it is serviced all matter as much as the product itself.
As a guide, ONE is rated for up to 3 years or 25,000 miles, Skyline for up to 3 years or 50,000 miles, and the glass coating Vista for up to 2 years or around 18,000 miles. Those figures assume the car is washed sensibly and serviced every 6 months or 6,000 miles.
So can you coat a car yourself?
Yes, with patience. Applying the coating is the easy part and most people pick it up quickly. The preparation is what takes time and skill, particularly paint correction. Beginner-friendly coatings such as Scoat v2 and Carbon are a good place to start, and our guide on how to apply a ceramic coating at home walks through every step.
If your paint needs serious correction, or you would rather have the job done for you, an accredited Ultracoat Pro studio will prepare, coat and service the car for you.
The short version
A ceramic coating is excellent protection against weather, salt, chemicals and UV, and it makes a car far easier to keep clean. It is not armour, it does not replace washing, and it only lasts as long as it should if the paint is prepared properly and the coating is looked after. Get those expectations right and a coating is one of the best things you can do for your car.
New to coatings? Start with what a ceramic coating is and what it can and cannot do.