Walt Sherrill
Member
I don't think the Stock II has wonder finish, though I see it is advertised as such. Could be wrong and occasionally am!
As noted above, citing information from the EAA website, Wonder finish isn't really a finish, and it's not hard chrome -- it's a surface hardening treatment which wouldn't make the colored surface hard to remove. The colored part of a Wonder finish hardened surface should come off just as you describe. Working on the metal itself, cutting or milling, would be a bit harder to do.