Hi guys. This subject has been beaten to death, I realize that, but I've been experimenting with Future and I found some ways that seemed to work well for me.
I followed alot of the advise here on the furums and got fairly poor results. I think one of the factors is that I live in Arizona and its very dry here. Obviously, some techniques that work in Houston aren't going to work as well here so adjustments are necessary. So this advise is mainly for the desert rats out there.
I experimented with pure Future, 50-50 Future/water, 75-25 Future/water, and a whole bunch of other ratios. I've found that in the dry desert a good mix is 75% Future and 25% 91 Isoprophyl alcohol. I have my airbrush, an Aztek A470 (with the white tip), set to about 16-18 psi. I spray the Future from about 4-5 inches away.
Now, the real key is slow and steady brush strokes. In my "trials" I got alot of grainy and rough texture finishes. That's because I was applying the future like I was applying Model Master Acryl. In order to get the shiny finish you have to use slow strokes...but keep the airbrush moving! As you apply the Future the surface of the model should look as though its getting very wet.
Also, I think it helps to set the model so that the surfaces being sprayed are level with the ground. For example, just do the top of the subject, let it dry, then flip it over and do the bottom, then let it dry, and then set it on its side and do the vertizal stabilizer, then let it dry. I got more runs when I sprayed the whole model while it suspended from a coat hanger or something else. It takes a little longer to do it this way but you can minimize any runs.
Again, this is what worked for me in the dry Arizona climate and I'm not suggesting that any other advise is bad. I figured I would post this for the frustrated desert dwellers who want to use Future.
Just my $.02