I've tried the adhesive backs stuff.... like hvac tape and such - WAY thicker than the stuff I'm using. For something large or a flat side crank the HVAC stuff is not bad - but no where near as "flexible" for the really contoured stuff.
I use a light spray of Super 77 - then press this thin foil down, working it with my fingers to get it as flat as I can over half the bait.... I then use popsicle sticks I've sanded/shaped to press and burnish it down into the details and rub flat the wrinkles as best I can. In some instances this stuff will rip if your a little too physical with it.... but if you look in the pics - on one of the tops I've added a few tiny piece to cover the rips and pressed it down - you can barely see it - I'm hoping with a shot of clear coat it will all be smooth before I start painting over it. I will admit - it dos seem to lose it's "shine" as it's worked.... but still has more reflection/bling than any paint I've used.
I believe the thinner the material the better... I'll look into the candy foil - cost isn't an issue - more just finding the right stuff.
J