ok, your spraying 2k paint yes? so when your applying 2k enamel (solid colour) or 2k clear over basecoat (COB) you usually mix the paint at a ratio of 2:1. 1 being the hardener.
you can buy different hardener rates from slow, medium or fast.
at work i normally spray with normal (medium) at a bake time of 40mins at 65 degrees
but a home i use fast it just speeds up the drying time. just make sure you give it a wipe with prepsol (aka wax n grease remover)
and a strainer (paint filter) to avoid dirt n crap in the gun pot or use a stocking if you dont have any.
if you need help with anything else just pm me.