right now in SOF- Hunters Speciality is the preferred paint since it is removable. Most guys now are using Krylon due to a better selection of colors and H&S is harder to find and requires repeated applications (not very heat resistant). A brass wire bench grider brush removes it if you need to check it for cracks for PMI’s etc.
There are no real oil resistant weapon paints right now, even duracoat has limitations.
There are barbecue paints and exhaust header paints, but I’ve only seen them in black.