That coating is pretty darn tough. As long as you don't chip it it's all good. All the hone does is remove any aluminum and such from the piston. I honed mine twice with no issues.
No sh**?... WOW. Yeah, i think it just had a bit of alum from a piston on it. Light scoring. The ball hone made it look good to me.... Dam, i wish i had a piston kit...
(it's for a l.c. s9)..(the piston kits are like $65-68 tho.... for an airsal anyway).. be an expensive try and hope...