When I tested the Miracle Blend paints I found that adding a product to them like Golden Fluid Matt Medium (what I was using at the time) or Liquitex Glazing Liquid (I have used this in the past with BabyFX paints) really helps the paints to stick well, not bead up and go on more smoothly.
Now that I am using RebornFX products, they have Emulsion mixed in with their paints and if I add more water to the paint I use a couple drops of extra Emulsion as well. It does the same thing. All 3 of these products work on the same principle of adding binders back in to the paints, slightly increasing working time and making them flow better. When painting AA I usually add some Open Time as well to extend my drying time then force dry with a hair dryer.