Measured with the Mohs scale, this would mean that the lacquer becomes as hard as diamond, with the result that there can no longer be scratches in the lacquer. However, the downside of this is that a very high SiO2 percentage is the ease of application, which is also the secret of many professional grade ceramic products. This is the key to preparing a ceramic coating with high percentages of quartz, which is also easier to apply for an average consumer. The coating industry adopted this in reverse and started using variations of standardised pencil hardness to measure the hardness of their coatings.
However, almost all DIY ceramic coatings have the same 9H coating grade which provides very hydrophobic characteristics and is also known to protect against UV rays. In short, the scratch resistance of a coating is much higher than a 9H on the pencil hardness scale. This tough protective coating will maintain headlights, clear coatings, vinyl wraps and much more, prolonging your car's protective paint coating for years to come. Therefore, it is recommended that professional-grade ceramic coatings be installed only by certified installers.
Ceramic coating is basically a liquid polymer composed of multiple linked molecules that use nanotechnology to provide a semi-permeable, water-resistant layer of protection. A ceramic coating is much better compared to a wax sealant as it can provide protection against bird droppings, UV rays, acids from insect splashes and much more for at least 3-5 years. The range of grades varies from 0 to 9 and the hardness is indicated by the letter "H" for that particular grade. So how is a 10H tile possible? The only way is that the coating has the same level of hardness as a diamond.
Hardness does not make a tile stain resistant, nor is it the best measure of tile performance.