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You want maximum heat energy at the top of the piston stroke, not heat being absorbed to break apart molecules that then recombine later when they provide less useful work on the piston.
The only thing I would contemplate coating a piston top (or cylinder head) with is a little bit of thermal barrier coat only if there is extra knock resistance headroom. That raises the surface temperature so less heat is conducted away, but you lose knock resistance.
I.e. if you have an E85 engine and you are okay with only running high octane gasoline or high ethanol fuel in there.
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