Fab may be overpriced, but in difference to woodstain it comes in different shading after what you prefere and what you are dipping. icon_biggrin
It contains a hardener and some ingredient's that make your colours stand forward.
I bought a can of FAB medium and up to this date dipped: 100 infantry of different regiments, 2 boltthrowers with crew, 16 dark riders, 1 chariot, 1 War hydra with handlers and 5 Cold one Knights and only used 1/3 of the can icon_surprised
Papabear
Shading: Use different thicknesses, less water = darker shade
Colors standing forward? That isn't physically possible, unless it makes everything brighter - in which case it is just a lighter shade of dip. There isn't a way to make the colors more saturated by coating them in something else, unless you are using a brighter paint color.
I bought a $10 can of Minwax Polyshades Antique Walnut and have dipped 2,000pts of Tyranids and 1500pts of Chaos Dwarfs, and I'm not done with it yet. That's one advantage of dipping, it goes a long way.
Oh, and I have an unopened, shrink-wrapped box of Cold One Knights if you're interested.