FIA rules

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FIA rules PDF (279).
The use of any ceramic component is forbidden.

While this coating is not a component, so not a part, this rule does not deny it. It can not substitute any part itself. An example: if we coat the outside of a beer can with our ceramic coating, the coating can not be removed from the can, therefore can not be used as a substitute beer can, to contain beer.

FIA rules PDF (252)
1.3 Material
The use of a material which has a specific yield modulus greater than 40 Gpa/g/cm is forbidden, with the exception of plugs, exhaust coatings, water pump turbo joints, brake pads, brake calliper piston coatings, rolling elements of bearings (balls, needles, rollers), electronic components and sensors, parts weighing less than 20 g and all coatings with a thickness less than or equal to 10 microns.
The use of a metallic material which has a specific yield modulus greater than 30 Gpa/g/cm or of which the maximum specific UTS is greater than 0.24 Mpa/kg/m for non-ferrous material and 0.30 Mpa/kg/m for ferrous materials (i.e. 80% iron) is forbidden for the making of all the parts that are free or homologated as an Option Variant.
Ti-6Al-4V ASTM grade 5 type titanium alloy (5.5< Al <6.75, C max 0.10, 3.5 < V < 4.5, 87.6 < ti < .91) is authorised, except for certain parts for which titanium is expressly forbidden. No turning part of a turbocharger or of any equivalent supercharging system (except the rolling parts of the bearings) may be made from ceramic material or have a ceramic coating. These restrictions do not concern the parts homologated with the standard vehicle. The use of magnesium alloy sheet metal with a thickness less than 3 mm is prohibited.

The yield modulus is defining the "hardness" of a material. This rule denies for example the tea cup (made of ceramics), because it had a hardness greater than 40GPa/g/cm3, as glass too. This rule denies specially the coatings for increasing surface hardness. Because our coating is made of a ceramics powder, and is remaining as particles on the surface of a coated part, and just a special binding material holds it on the surface, therefore the yield modulus is much lower than 40 GPa/g/cm3.
Turbine shafts of turbochargers, compressor wheels can not be coated as of the rule, but the really important parts getting very hot - as turbine housing, exhaust manifold, wastegate housing - can be coated.