Spray Gun

I use the "cheap" hvlp guns from Sumitt or TCP Global. Decide who's primer/paint you will use and look up the tech sheets. It will say what size tips. Cheap enough to have a primer gun and a topcoat gun. Cleaning the gun, especially with epoxy and heavy urethane primers is a must.
Get moisture/oil traps and apply to air system, plus a water trap at your gun.