For one, as explained above, beading does not concentrate anything. It's not a cause or an agent acting on it's own, that somehow collects and deposits all the minerals from the water in a small area; but the direct result of most of the water mass essentially rolling or sliding off the paint without leaving anything back. Obviously this process is not always perfect - and the small imperfections in it, the small water droplets that are left back are the beads. But the fact that most of the paint will be free of water to begin with, already reduced the amount of mineral residues that can be possibly left back on the paint, by magnitudes - and that's obviously a positive thing.
And the second thing is: the thing that's causing water to sheet *off* completely is the very same thing that's causing beading. It's hydrophobicity. What differentiates between whether the water will sheet off or create droplets - and the mixture between those - is:
1. the amount of water reaching the surface and the (spray) pattern of it,
2. the general smoothness of the surface,
3. the level of hydrophobicity of the surface (perfectly hydrophobic surfaces tend to break up water more into small drops, than do less hydrophobic ones, which allow them to spread more, and thus connect with each other)
4. possible random contaminant on the surface, and of course
5. the angle of the surface.
If these are optimal (not each of them individually, but all together, as a set), then water might sheet off the surface perfectly, without leaving many - if any - beads back. But if for ex. the water is rolling off too quickly, and because of that tends to break up into smaller individual streams, or the surface is too flat, or there are a lot of random contaminants on it, or the spray pattern doesn't allow a flush and continuous water surface to be created over the paint to begin with, then sheeting will not happen or it will be imperfect, and will leave droplets (beads) behind.
So, both beading and sheeting are the result of the exact same thing, and there's no such a thing as a product causing sheeting and another one beading. Of course different products might induce slightly different water behavior on the very same panel, because they might create a differently smooth surface, or they might exhibit different levels of hydrophobicity, which in turn might result in the water trying to leave the surface in different patterns and at different speed - and these latter two directly affect whether and how much beads there might be left back.
But the very same products that on one panel will cause the water (sprayed onto the surface in a specific amount and pattern) to sheet of almost perfectly, will create an insane amount of beads on a different panel, that has a different angle, while the other product, that left a lot of beads on the previous panel might leave back now a surface perfectly void of any water on this second panel, because the water will just fall right off it (not even sheet or bead, just fall right off). Same thing with different spray patterns: one might create a lot of drops (like if you're spraying water as a mist), while others might allow it to sheet off almost perfectly (for ex. when running out of the hose freely in a thick stream). It all depends on the circumstances.
