s30v gets light surface rust from sweat in my pockets, some people never saw that happening, i do, i guess some people's sweat is more acid than others'.
to clarify, this usualy happens when i have it in my kitchen trousers pocket with the apron above and when the service gets really hot. this is not everyday, but it happens. IWB i try to avoid so i don't know but i guess if you don't work too hard that'll be fine.