What is a Ceramic Coating, and What Does It Actually Do?
A hard, glossy, water-repelling layer bonded to your clear coat. Here is what it does well, and what it does not do.
A liquid that becomes a hard layer
A ceramic coating is a liquid applied by hand to a car’s paintwork. Most are based on silicon dioxide (SiO2), the main ingredient of glass. As the coating cures, it bonds to the clear coat and hardens into a thin, transparent layer.
That bond is the difference between a coating and a wax or sealant. Wax sits on top of the paint and washes away in weeks or months. A coating becomes a semi-permanent part of the surface.
What it does
The first thing owners notice is how water behaves. A coated surface is hydrophobic: water forms tight beads and runs off, carrying loose dirt with it. The car stays cleaner between washes and is much easier to wash when the time comes.
A coating also adds depth and gloss, and it resists the things that dull paint over time: UV light, bird droppings, tree sap, road film and harsh cleaning chemicals. They still need to be removed, but they are less likely to mark the surface before you get to them.
What it does not do
A ceramic coating is thin. It will not stop stone chips, and it will not prevent deep scratches, scrapes or dents. Protection from impacts is the job of paint protection film.
It is not permanent. A coating wears gradually, and how long it lasts depends on the product, how well it was applied and how the car is kept and washed.
It does not make a car self-cleaning. A coated car still needs regular washing, and it can still pick up water spots and swirl marks if it is washed carelessly.
How it is applied
The preparation matters more than the coating. A coating locks in whatever is underneath it, so the paint has to be right first.
The car is washed and decontaminated to remove bonded iron, tar and grit. The paint is then machine polished to remove swirl marks and restore gloss, and wiped down so no oils or polish residue remain.
Only then is the coating applied, one panel at a time, levelled and left to cure. During curing the car should be kept dry and clean, which is why this work belongs in a controlled indoor space.
Looking after a coated car
Wash it regularly with a pH-neutral shampoo, clean wash mitts and plenty of water. Dry it with soft microfibre towels rather than letting water dry on the paint in the sun.
Avoid automatic brush washes and strong degreasers, and remove bird droppings and sap as soon as you notice them. A periodic maintenance wash and inspection by your detailer will keep the coating performing as it should.
