So how thick is a cerakote finish and how well does it work on the inside of an action? Certainly, the bore isn't coated, so would a cerakoted carbon steel barrel be more likely to rust than a stainless steel one? I'm genuinely clueless about cerakote, so my questions aren't facetious. I've handled a few cerakote guns like a Nosler. I've also sort of gravitated towards stainless steel because I like how easy they are to clean and how small blemishes can just be buffed out. I had a blued gun that had a burr on it. It was brand new so the manufacturer fixed it and refinished the whole gun. Stainless would have been so much simpler. I sometimes wonder how good of an alternative cerakote would be.
Since Cerakote IS a coating, and WILL wear off in some areas exposed to abrasion, a Cerakoted barrel will be less rust resistant then a stainless barrel, IN THE AREAS WHERE IT'S WORN THROUGH.
Stainless steel is Stain-LESS, not totally rust proof. Even stainless steel will rust.
Cerakote is superior to common blued steel and parkerized steel, of course much less wear resistant then stainless steel or a hard chromed gun.
The inside is typically not coated with Cerakote, it's primarily an external finish but can be coated in some interior areas.
It's applied in a very thin coat running from 0.5 to 1.0 mils thick.
It's so resistant to chemicals, the only viable way to get it off is to bead blast it off. Virtually no common chemical can attack it.
The durability of the coating depends on the correct application.
Application is WAY more complicated the just degreasing, bead blasting, and coating.
Cerakote is very specific down to the TYPE of bead blasting media used. Use the wrong type and the coating won't adhere properly.
The Cerakote site has a lot of info, including a tutorial on the involved process of application....
https://www.cerakote.com/