Opti-Coat is a class of ceramic coating that has a few key differences from other coatings. Most ceramic coatings consist of silicon dioxide particles embedded in a carrier that adheres to the clear coat of the car. Opti-Coat is a ceramic carbide that is not embedded in a matrix but bonds at the molecular level with the clear coat. It has a hardness of 9 on the MOHS scale, as opposed to 7 for silicon dioxide coatings. It is also impervious to almost all chemicals a car might encounter as well as to pH extremes.
It also requires professional application, as it is somewhat tricky to handle. The car first has to get a paint correction (if needed) and be polished to prepare the surface for the molecular bonding. Opti-Coat Pro3, which is their newest product, requires four coats of two different compounds. However, it builds to an 8-micron thickness, which is thicker than the typical clear coat on a new car. It is also permanently hydrophobic and never needs waxing.
The big downside of ceramic coatings, including Opti-Coat, is that it does not give the resistance to rock chips and similar encounters that good a PPF (paint protection film) will give. On the other hand, it is easier to touch up a small chip with Opti-Coat than with a PPF, which usually has to be replaced.
We had an earlier generation of Opti-Coat on a car we just traded at six years, and the paint was still pristine.