AllenM does exceptionally good work.AllenM has done several for me and he will do several more I am sure.
The three people that I'd recommend in the area have already been done.
Havlin's did a pistol frame for me a few years ago. Great communication, good guy. One day I may very well have more work for him. I follow him on the FB - and I think he's also capable of hydro-dipping as well. But I don't know how much he LIKES it. Havlin's Firearms Finishing If you contact him - follow the "required" ways to do so via his website. Do. not. just. show. up. there. Period. You can also initially contact him here on INGO - squirt239.
AllenM of Diamond Collision out in Avon is also GREAT with Cerakoat work. Note: Bad weather months are his busiest with the car-repair business. That's his main bread and butter. Be prepared for him to say "I can do this, but it may take a while".
USDS in Greenwood: I'm a customer and a "fan" of the shop - even though I haven't yet purchases a big-ticket item from them. They're good dudes - local to Greenwood. I've only seen photos of their CK work.