Hi guys
Returning to the original question :)
The usual order for applying future is the following. (I say usual because there are exceptions, like "metal finish" paintjobs for example).
1 - Paint (acrylics, enamels, lacquer, other)
2 - Future (at least on the places that will receive the decals, to avoid the silvering effect)
3 - Micro Set (to prepare the surface for the decals)
4 - Decals (again, we are talking about the most common type of water-slide decals, not the dry transfer ones :) )
5 - Micro Sol (to adapt the decal to the surface)
6 - Future (again!. To protect the decals for the following steps)
7 and following -Weathering (whatever strikes your fancy: washes, pin washes, pigments, clear coats, etc.)
I usually apply the Future (or any other self-leveling acrylic floor wax I have at hand, since I am no fundamentalist :) )
with a wide flat brush that I use exclusively for this.
I used to apply it with airbrush, but I finally realized that with a clean flat brush is much better.
I hope this helps!
Cheers
Antonio