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If I am understanding correctly what you are asking, then I would suggest that you check out the temperature capability of the coatings that outfits like Swaintech offers for coating the combustion chambers and piston crowns.
I agree with AB's answers regarding the boundary layers' protecting the metal surfaces from the temperatures occurring during the combustion process. But, I think that what you are needing to be able to do with your coating is to actually withstand the combustion temperatures themselves. Which will be somewhere between 2500F and 3000F. [...you were asking about the 'max' temperatures possible, right?].
So, finding out what temperatures commercially available coatings for CCs are capable of withstanding should help you determine if either of your formulations can take the heat that they will see in there.
I like your idea. To be able to reshape the CCs of my iron SBC heads into shapes of a fastburn layout without welding would be really nice.
good luck
TF
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