re: Ceramic coating. Was this an original component, or was it made and failed? Are you running a standard factory exhaust, or have you changed something in the run of the system?
If you can stand the wait, repair (or replace) the cracked component, then fit it up and run it for a few thousand k's. Remove and inspect, if it's still good
then coat it. Saves the heartbreak of "Oh, my very sexy ceramic coated exhaust has cracked in the same place as last time . . ."
Nice job on the rebuild, and I do love the blue.