Careful there. Behr house paint has nowhere near the same performance as something like an industrial or automotive paint (Sherwin CARC being one example). CARC paints are polyurethane-based, whereas Behr is a 100% acrylic. Not quite the same. I went ahead and played around with the Behr paint myself anyways, letting it cure for over 2 months and I can still leave a mark in the paint with my fingernail if I press hard enough on my aluminum paint lid that I used as a sample surface. If I go to one of the CONEXs on base and try to scratch the paint with my nail IT IS IMPOSSIBLE. Industrial and automotive paints (such as certain types of Sherwin or PPG CARC as it relates to this topic - they have different types),
especially 2-part/catalyzed paints, are going to be
rock solid and
very difficult to scratch.
If you're planning to paint a large MV like a LMTV or Deuce that you don't intend to take out offroading and just plan to keep out on display or cruise around on the pavement, the Behr paint is a fairly solid solution. Premium Plus will give the flattest sheen. Considering it's the cheapest line and also looks the best (and seems to be more difficult to scratch, seriously) it is a win-win. Between the Premium Plus, the Marquee and the Dynasty, go with Premium Plus if you want it to look the most authentic. If you have a smaller MV like an M1030, LSV or CUCV that you want to off-road, it may suit you better to go with the real deal and buying genuine catalyzed industrial or automotive paint. Sherwin Williams sells the CARC primer, paint and catalyst that are all designed to work together. You just need to go to a retail store and they can get a business account created for you. I can't speak for the PPG CARC as I have not explored that avenue.
I have to say I really went down the rabbit hole with paint and was quite disappointed with all the hype around the Behr paint. It is not bad in a pinch, but it is not entirely the magic bullet it seems to be for refinishing MVs.
If you want a more affordable option along the way of catalyzed paint, although you'll be limited to flat black, there are
2-part epoxy primers and
2-part paints in spray cans available online. This way you can still have the durability of a flat polyurethane (which CARC is) without the chem resistance or military green color.