(Body guys) Painting interior metal trim 67-71

What have some of you done for painting the metal interior trim. Did you use base coat/clear coat? Is the clear coat effected by body oil,salt,sweat when you have your arm on the door. The factory used enamel but it doesn't seem to be the right route anymore. I am having my car painted next week and I'm wondering if I should have them do the interior stuff in enamel instead of basecoat/clearcoat. I mentioned my concearns to him and he said he will have to locate a gun for spraying enamel because they used a different gun. Thanks for any input you can shed light on. I am having my a pillars,doors,b pillar and rear seat area redone and I only want to do it once and have it last.
I use base/clear. I use a flatting agent in the clear. PS you don't need a different gun for enamel. at least I never did