RE: WD-40
Greets,
I used to use it as a finish lube on an old cap an vball revolver I own.. took the blueing off! ( maybe just because it was a kit gun I blued at home dont know ) I have reblued the poor thing three times now, but after the second I quit using WD-40, asked a gunsmith about it he recommended against it too.
Just my uneducated opinion!
Terry