Be very careful about this...
There is a right way and a wrong way for these coatings.
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In general, metal sections are used to conduct heat (away).
Putting coatings on the wrong surfaces can increase (internal) heat (into the cooling and oil systems).
Mazda engineers have documented that the rotary engine oil system takes care of 1/3rd of the heat (dissipation) from the working engine.
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I'm running Ceramic coated rotors on the recommendation of my engine building
(Rick Engman)
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You should remove the word "internal".
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Point taken
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It is also not recommended for critical clearanced surfaces.
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I was not recommending this surface treatment. Yes it wrecks a finished machinied surface. I have had to remachine shot peeded race piston engine parts it's sucks