Decades ago, Rustoleum was a reliably high-quality product that I used for a wide variety of non-model and occasionally modeling projects.
I never had any issues with the stuff, and their fish-oil based "Rusty Metal Primer" was about as close to magic for protecting steel stored outside as I've ever seen.
Now, as with so many other products plagued by "offshore" production and only spotty quality control, you never know from can to can if you'll get anything that's even usable.
I still have acceptable and very predictable results from most Duplicolor products (though they seem to be constantly tinkering with and renaming their primers), and Tamiya made-for-modeling paints are the best currently-available rattlecan materials, period.