Lance, Tamiya X21 is Flat Base, X22 is Clear. You can mix flat base (or flat paste as it is sometimes called) with Future. Personally I think this is ill advised, but I have tried it before and it definitely does work. (I just wonder what it will look like in 10 years...) I think with Future the ratio is about 10 parts Future to 1 part Tamiya flat paste. Be careful not to use too much flat base or it will dry with a weird milky blue hazy fuzz. I personally prefer using X21 + X22 to concoct whatever sheen I want; the products are designed to be used together and I find it sprays nicer. X22 + X21 + Tamiya thinner @ 4:1:5 sprayed @ 10 psi gives a nice matte finish. Your mileage may vary though, and yes, Future is cheap...