I am no expert but have painted a few things with different types of CERAKOTE. The CK is Very durable and what you may face is that anything less durable may eventually scratch or flake off. Another thing is that you can mix or apply different Clears and Paints with some of those being specifically formulated to prevent things sticking to it.
If your painter is using the straight CK gun paints though, the scratching and flaking would what may take place like I said.
Santini will tell you though that it all comes down to the prep before painting.