I can't find anything other that the typical Cerakote answer to this question, which yes, is quite nice.
Have we found a cheaper way that will hold up?
The P320 having the inexpensive grip modules just screams for having frames coated in many wonderful ways.
So, what do we think would be the best way to do this without going to the expense of Cerakote?
And I will go one better - show us your refinished grip module.