Fibonachu - the coating isn’t think at all, I took a look at the threads and I didn’t notice any perceptible build up, I don’t anticipate having to chase the threads.
Dougs - I’m surmising this, Cerakote is a commercial coating process, only applied thru franchise holders. It’s more known in the firearms sector I think. They have high temperature rated coatings, the colors are limited compared to non high temp selections.
Do a search on the cerakote name and you can find their site and search providers by ZIP code or city/town. My closest one was about an hour away.