My 572 hemi pistons were spec'd for a heavy dose of nitrous and got the domes ceramic coated by Diamond. It's the tan or gold colored coating. Can't say much for it as they've been that way since new. Haven't hurt one yet.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax