Jafar,
I've tinted windows and canopies with Tamiya smoke and clear yellow - worked pretty well but I had to experiment on application techniques to get an even, clear non-frosted look. Try it out on clear plastic sheet first.
The Future that everyone talks about is indeed Future Floor Wax, available at just about any supermarket in America.
It's vastly superior to just about any clear gloss I've ever used - lays down very well and dries very quickly. It also takes a bit of getting used to to apply correctly - just airbrush 3 or mist coats, allowing at least 10 or 15 minutes between each, then try nailing it with a wet coat. Again, practice is the key and you'll figure it out.
There's about a million posts in the painting section of this forum that refer to Future - have a look and you'll get heaps of answers to questions you haven't even thought of asking.
Cheers,
LeeTree