I know I will probably be stoned, or at the least burnt at the stake for saying this, but I found thinning the future a bit with Tamiya acrylic thinner works WONDERS on my future finishes.,.. gone are the rouch textures, no more runs and heavy areas.. I just spray several light to med coats and it is done!
I started doing that when I was playing with using future as an undercoat for Alclad and won't go back to pure future again!
If you can't get your hands on Tamiya thinner a tiny bit of water might work (try it on a junk model or such).... I've also brushed it on like Richard with decent results...