I bought a big assortment of MS paints a long time ago (somewhere between 10 and 20 years ago), and had mixed luck with them. Some of the colors worked fine; others had the consistency of syrup, and were just about unusable. But Don is right: the stuff Model Expo is selling now is completely different. I've bought four or five different colors in the past few months, and they all work fine.
There are lots of good colors in that line. I particularly like the "warm white," a very slightly off white that, to my eye, is just right for lots of sailing ship uses. There's also an off-black, called "iron/cannon black," that's slightly different from pure black ("hull/spar black"); just the thing to distinguish iron fittings from black-painted ones. Also a couple of buffs that look nice for various painted parts of a sailing ship.
One possible source of confusion is the color called "hull copper red." It doesn't look like copper; it's a dark, brownish red. It's a really good match for the anti-fouling red paint that's been in use on wood ships and boats since the very late nineteenth century. That prototype pain looks bright copper when it's brushed on, but oxidizes to the dark, dull red within a few hours of application. I really like the ME color, and intend to use it on the bottom of my current project, a fishing schooner from about 1912.
I haven't tried any of the metallics yet.
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