As I stated in a recent post about striping Athearn paint jobs - oven cleaner will work, so will citrus based degreasers. An added bonus is then you just need to scrub, you’re already using a degreaser.
I’ve used Dupi-color spray can primers and etch primers and paints on some projects…works great…if your in a bind/dont have a airbrush or spray guns or compresser…