As above, Cerakote and other such finishes are just an epoxy paint.
The closest you can get a blued gun to be like stainless is to have it hard chrome plated.
This it NOT like "bumper chrome", hard chrome is bonded directly to the steel and can't chip, crack, or peel off.
It's one of the few gun finishes that's considered to be a true lifetime finish.
It's extremely hard, and actually makes the trigger and action smoother.
In appearance it ranges from a satin light gray, to a brushed stainless steel look, to a bright polish.
There are a number of top professional companies offering hard chrome for guns, one of the best is APW/Cogan.
http://www.apwcogan.com/
There are others that are also very good, like Ford's, Armoloy, Metaloy, TechPlate, Elite Custom Guns, etc.