Howdy HastyP,
I'll throw a few Farthing's on the table as well...
I'm not a big 'Future' fan, and our Gunnie has explained part of my hesitation to use it. Like Gunnie, I am very atuned to the 'leveling out' of my finishes. I have always felt (just MHO, so no beating my head in from all you Future aficionado's

) that Future builds up too much. Put simply, if I can see the build up with my naked eye, it's
too much for me.
But, whether it's Future or regular clear coat, I apply it all over the kit so that my coat is uniform, period. Now, before I go any further, I must add this caveat; I don't always 'gloss' coat the kit. Depending upon the final 'look' I'm going for, or the
seperation of looks, I will gloss coat, or 'matt' coat the kit. To further complicate the process, sometimes I will gloss one portion of the kit, and 'matt' another.
For my decals (I really prefer dry transfers big time), I'll gloss.
To possibly expand on the gloss vs. matt 'thing', a quick example of where this applies is horizontal vs. vertical surfaces. Weathering, and the elements that cause the 'weathering' to be there in the first place, are not static. The dynamics of the elements of 'weathering' are affected by both their delivery to the vehicle in question in the first place, as well as their daily affects and inconstant appearance to the finish of the vehicle. Dirt, grime, etc. that has clung to the somewhat vertical sides of the turret of a tank will have a decidely different appearance (via dynamics such as gravity, rain, downward movement) than the
same dirt, grime, etc. that generally sits ( gets stepped on, ground-in, spilled on, etc) on top of the horizontal surface of the top of the turret. Therefore, the ' weathering' of the top of the turret (horizontal surface) should be somewhat more pronounced and more 'static' in appearance than the sides (vertical surface) of the turret where the 'weathering' should be more 'active' and mutable.
Where the gloss vs. matt comes in is in the static vs. active application. Where I need a more 'active' or flowing appearance to my weathering I apply a gloss coat. Where I want a more 'static' look , I will use a matt coat. Heck, sometimes when I'm looking for a
very 'static' look (fuel stains are an example), I'll leave it flat.
I know this was probably more than you asked for , but..................... #:-)
Tread.