I have used the VHT engine enamel paint on my AMD 65.
It will take up to 550°F you won't get your guns that hot.
It goes on easy, let dry over night, cure (bake) the next day.
It makes a finish that I can scrub with acetone & it will not come off.(Tryed it)
That means that gun solvents won't touch this finish.
VHT Engine Enamel™
I use a gas smoker to cure the paint.
To cure it only takes 200°F (93°C) for 20 minutes.