Miss you too Mik you moron....
Yeah possibly Teflon D? Not sure. It's all the go to coat things now. These are the pistons out of my Skyline (Teflon skirts and ceramic crowns)-
Supposedly Teflon reduces wear and friction and the ceramic reduces hotspots, damage from pinging/detonation and just looks plain awesome! Seems a shame to hide it inside the engine!