I don't normally do autos, so Future is all the way for me too! (as in Future floor polish from the grovery store, about $3.50 for a quart or so)
However I have seen some autos done here, clear coated with Future that look absolutely fabulous!!! They just gave it sometimes as many as 6 coats of Future! The beauty of future is
if, (or
WHEN in my case) you get a fingerprint or something on it before dry, a shot of windex on a towel, rub it off and refuture is all that is needed! once cured it is impervious to almost everything.... anything with ammonia can kill it though so be careful when cleaning around a futured model!
One thing it DOES do wonderful on, for all types of models is clear parts... here is a link to a how to on it.
swannysmodels.com you can even tint the future and give a tint to the windows, as in car tinting, the green tinting on helicopter overhead glass etc... it even helps prevent crazing and hazing of windows from the fumes of the glue, and can save a scratched canopy or windshield...