Unless you're planning to trailer the truck everywhere and never do anything other than drive it on and off the trailer for a car show, the paint won't stay put. Brake parts are there to generate HEAT, lots of it, because that's what stops the vehicle. The paint will peel off in a matter of a few minutes of normal driving. Paint on calipers also serves as an insulator, keeping them from dissipating the heat they create. Boiling brake fluid doesn't stop worth crap, as anyone who has experienced brake fade can confirm!
Jerry