Recently, I stumbled onto an easy method for painting white. I have multiple white paints and I've grown to hate them all. They each have issues with coverage. Some are too thick, some too thin, some grainy or crackle after they dry. After reading a positive review on a new US paint, Monument Pro Acrylic, I bought a bottle of their Bold Titanium White and 1 of Coal Black. These come in 22ml jars with a glass agitator. The agitator is a nice touch but to be clear, the paint itself is very close to the consistency of my Vallejo airbrush paints. It is not thick at all so the agitator is just a nice touch.
Step 1 is to get a bottle of Monument's Pro Acrylic Bold Titanium White. I haven't been this crazy about a hobby product in a long time. You'll also need a pot of Citadel's Apothecary White contrast. With these in hand, I start with a Zenithal primer over my figures. That's a gray primer all over followed by white primer sprayed directly from above and rocking out just a bit. You're trying to keep some gray intact in the folds & shadows. This does not have to be perfect.