I'm in agreement with HawkeyeHobbies, use it for accents and details...
but if you must try to reuse old foil try that adhesive the craft ladies use on their "gold leaf" projects.... I've had pretty good success with it and plain old Tin foil..., though there are dozens of makes, you would need to do some testing to find out just the right one.. And there are "aluminum foils" for that hobby, but don't waste your time, way too fragile.
[Tin foil hint: the cheaper it is the thinner it will be, also "baked potatoe foil" will be WAY thinner - that is if you can find it!]
-sean